The REPLACE function is a built-in function in Excel that is categorized as a String/Text Function. The basic uses of `sed` command are explained in this tutorial by using 50 unique examples. I am thinking of sed's "in -place" replacement feature but this fetuare needs and input file. It offers numerous methods for you to render PDF elements such as text, images, shapes, forms, watermarks, and annotations on to documents. As you can see, with awk you can print any column you. If you’re wondering how to search and replace string with C#, then you’re at the right place. txt EDIT: I know it's not sed, but sed might not be the best tool for this job. With AWK, I can do a "head -n 10" on the result of the AWK operation (or on the input data file), and immediately verify that it works as expected. Let's assume you have a file named "b" in a directory called "tmp", with a symbolic link to this file: $ ls -l b lrwxrwxrwx 1 barnett adm 6 Mar 16 16:03 b. If this is the C shell, then. LEFT function: Extracts the specified numbers of characters from the left of the text string. Run in compatibility. Files and folders, on the other hand, can be selected as seen fit and the files do. template - Template a file out to a remote server The official documentation on the template. Find and replace basic text. NET designed to minimize certain types of bugs in code. I am looking for a acrojs script to display a Place Holder or "ghost test" in a Form's text field. It can be used as a worksheet function (WS) in Excel. How to Use "Find" and "Find and Replace" Features in Microsoft Word Documents. replace - Replace all instances of a particular string in a file using a back-referenced regular expression The official documentation on the replace module. history - Command History. Here are some examples of using the utilities found on Unix (available on some other platforms also) for manipulating the text in files. This seems to be one of the strongest points of the unix tool philosophy: Ability to check partial results in no time, and so iterate quicker on developing long "pipelines" of chained commands. LEFT function: Extracts the specified numbers of characters from the left of the text string. , binary, stateful and nested patterns or formal grammars, regex patterns with match groups, etc. The data in the csv file contains kind of expense report. #! /bin/bash while read LINE do echo ${LINE%?} done < filename 3. Using UNIX tools such as sed (string editor) and awk (named after Aho, Weinberg and Kernigan) are indispensible skills for the Oracle professional on UNIX and Linux. How do I change the text files all in one fell swoop as I would with my trusted Sed? Thanks. Typical needs might be to generate HMTL codes or print codes for boldface, italic, or underscore. Using string functions in AWK. This pattern could consist of fixed strings or a pattern of text. You want to issue a simple command to replace all the occurrences of the string foo with the string bar in the file myfile. using namespace System; using namespace System::IO; // Move a file into another file, delete the original, // and create a backup of the replaced file. It returns no index. `awk' prints: Match of fo*bar found at 18 in My program was a foobar Match of Melvin found at 26 in This file created by Melvin. In this case, any file named on the command line is modified in place, so you may want to make a copy of the original before converting it. File utilities: chgrp: Changes file group. Processing files with awk The awk processing utility can practically be used as a programming language -- but first you need to learn its simpler features. txt , i have a string web1 i need to cut the number "1", and increase it by 1 so it will be 2 then replace web1 by web2 that is what i did so far any idea how to. From the following article, you'll learn how to print lines between two patterns in bash. I have multiple text files, that contain a line, similiar like this: ref_t = x x I would like to replace x x in the first file with the first value of the string, so the result will be: ref_t = 298. awk is a utility/language designed for data extraction. It is often preferred if no index is required. If you need to add a line to a file in Linux, and you need to add that line in a specific position of the file there is an easy solution, even if you need to do it to hundreds of thousands of files. Of course you can do that in Notepad, but not from the command line. Advanced Find and Replace is exactly what the name implies. The following command runs a simple awk program that searches the input file BBS-list for the character string `foo' (a grouping of characters is usually called a string; the term string is based on similar usage in English, such as "a string of pearls," or "a string of cars in a train"):. Python Replace String Method for multiple files. Hi, I need to replace an entire line that contains a certain string with another line. stackexchange - filter lines based on line numbers specified in another file; stackoverflow - three file processing to extract a matrix subset; unix. This is the second part of a three-part article on the Awk one-liners. Skip to content. When a line matches, awk performs a specific action on that line. Left String - Extract characters from the beginning of a string Description: Similar to the Left function in VB a batch script can return a specified number of characters from the left side of a string by specifying a substring for an expansion given a position of 0 and a length using :~ while expanding a variable content. To write a file and read it back later on in the same awk program. txt" in the current directory, and "tmp/b. Parameters first, last Forward iterators to the initial and final positions in a sequence of elements that support being compared and assigned a value of type T. I'd like to use sed/awk/grep if possible. For instance, consider the output from this previous tip where we audited for the members of the sysadmin role across multiple SQL Servers. In the upper-right corner of the document, in the search box , type the word or phrase that you want to find, and Word will highlight all instances of the word or phrase throughout the document. How to use the Linux sed command to edit a file in place, i. When you're searching for many patterns, you should replace the text between the quotes with '-f file. helloworld. As follows: line in file is: #define VERSION "1. As follows: line in file is: #define VERSION "1. It offers numerous methods for you to render PDF elements such as text, images, shapes, forms, watermarks, and annotations on to documents. We can even do all that from the command line, although we'll hold off on that for a moment. Structured text tools. One of them, which is called substr, can be used to select a substring from the input. To replace a string with another that is shorter or longer you will need to copy the data to a new file. Variable interpolation is done before the Regex. I have jest started learning Python. First, you're rude when you're wrong. , not having to use the cp or mv commands to edit your original file. grep grep (Global Regular Expression Print) is used. Google today announced the launch of new desktop application for Google Drive users, called Drive File Stream, which is now available to G Suite customers. Awk is a programming language that is strictly focused on pattern matching and reporting from text files. i want to replace the second occurance of string (6 Replies). You can specify this when you save the file (for instance, in Notepad, this is listed in the Encoding menu of the Save As dialog box). How to Insert a Line in HTML. or the same line/record from any file, one awk script. awk include file to invoke the extension properly. In recent version of awk there is a inplace option that can be used to do in place operations similar to sed's -i option. In V8i this is no longer available. There's an optional third argument which is the number of characters to grab. You will find them in SYSTEM, String. txt" will be unchanged. We can: 1) open up a text file; 2) read the text into a variable; 3) do a search-and-replace on that variable; and 4) re-save the text file. Whenever you need to process a file in-place, transforming the contents and writing it out again in the same location, you can reach out for the fileinput module and use its inplace option:. grep grep (Global Regular Expression Print) is used. Author: Sakari Mattila Updated: 14-Sep-1999 Sed and tr are old and simple batch editors in Unix systems. Processing files with awk The awk processing utility can practically be used as a programming language -- but first you need to learn its simpler features. Print the file on screen with cat f127. Compare >>> x, >>> print (x), >>> repr (x), and >>> print (repr (x)). Awk supports most of the operators, conditional blocks, and loops available in C language. file – Manage files and file properties The official documentation on the file module. Nawk is new_awk and gawk the gnu_awk. For instance, consider the output from this previous tip where we audited for the members of the sysadmin role across multiple SQL Servers. Within a shell script, sed is usually one of several tool components in a pipe. wav and I want to replace wav from file name. Python replacing strings. To replace found text: Select the magnifying glass, and then select Replace. I have multiple text files, that contain a line, similiar like this: ref_t = x x I would like to replace x x in the first file with the first value of the string, so the result will be: ref_t = 298. We can force AWK to treat a string of digits as a number by performing some arithmetic on it. The user may replace multiple search strings, and load & save lists of search strings for future use, saving time in program data entry. As follows: line in file is: #define VERSION "1. 1) When user of the form puts cursor in the Form field, the Place Holder text is removed. QString &QString:: setNum ( int n, int base = 10) Sets the string to the printed value of n in the specified base, and returns a reference to the string. You can use this argument to indicate which occurrence you want to substitute. REPLACE provides functionality related to that provided by the TRANSLATE function. php) and place it on PHP enabled server and load it up in your web browser, then you should see "Hello World!" displayed. In the last post, we talked about regular expressions and we saw how to use them in sed and awk for text processing, and we discussed before Linux sed command and awk command. Having opened the file listfile. Variable interpolation is done before the Regex. Most of the time people will face this in their daily work life if they work on unix exclusively. When I execute PS>cat * | %{$_ -replace "expression","replace"} in a dir with multiple text files needing changed, this doesn't actually change the files, just what's been read in (then outputted to screen) by get-content. Replace file1, file2, and file3 with the names of the files you wish to combine, in the order you want them to appear in the combined document. Then a regex substitution is used with the /g modifier to globally replace all the occurrences of the old text by the new text. An extended awk could at least add new types of patterns, e. Our sample file /tmp/file This is line one This is line two This is line three This is line four Here we will search for line having the string "two" and replace the complete line with "your text " # sed '/two/ c \your text' /tmp/file This is line one your text This is line three This is line four To do in place replacement in the same file. For example, often you encounter a CSV file (where CSV stand for Comma-separated values) and you need to extract some information from there. This utility can be used to delete expressions from a file which can be identified by a specifying delimiter (such as a comma, tab, or space), by line number, or by searching for a string, expression or the address of a line in the syntax of Sed. Once it has been created, its value does not change. Awk is a programming language that is strictly focused on pattern matching and reporting from text files. Python replacing strings. This is the second part of a three-part article on the Awk one-liners. This batch allows string substitution in a text file. If the string to be searched is an array, find and replace is performed with every array element; If both find and replace are arrays, and replace has fewer elements than find, an empty string will be used as replace; If find is an array and replace is a string, the replace string will be used for every find value; Note: This function is case-sensitive. If you change your mind about replacing text, choose Edit > Undo Replace Text (or Undo Replace All Text). How to Concatenate Text in Microsoft Excel. If alignment is positive, the text is right-aligned in a field the given number of spaces; if it's negative, it's left-aligned. Introduction. 2) same as above but use MouseOver, MouseOut. VBA Find & Replace (A Microsoft Word Help & Tip page by Gregory K. Replace string of a. The Linux grep command is used as a method for filtering input. Beginning with these concepts, you will see how powerful Perl can be in the hands of a systems administrator. Searching and Replacing vi also has powerful search and replace capabilities. Firstly, the file content is read via readlines(). This “Replace text” feature is not case sensitive. Pretty much want to be able to replace "XYZK" with activefilename. You also have a habit of ignoring standards, which is a problem in the programming world. Microsoft launches a Q&A site to replace MSDN and TechNet. awk and perl both allow writing full programs, but I primarily use both as short one-liner programs which allows them to be piped to/from other Unix programs. Awk; POSIX commands. source is a string where you want to replace. The program has the ability to search Text, MText, Block Attributes, Multileader Text, Table Cell Text, Dimension Override Text and all of these items within Block Definitions. 5 4 3 New text 2 New text 7 New text 6 New text 5 4 8 9 6 3 1 3 4 ~ ~ !awk '{print "New text",$0}' You can string UNIX commands together using the pipe separator (|) to create complex and powerful filtering within your vi session. Suppose we have a file in which each line is a name followed by a phone number. You can also use a space (as in the example below) and the items will have no space between them. Sed can make the same input pattern produce alternating output each time it is encountered. The parameter b is optional, in which case it means up to the end of the string. How to use Replace function to remove quotation marks in text string I have a VBA statement that removes spaces from a variable containing a text string: myVariable = Replace( myVariable , " ", ""). Manipulating strings using awk A Bash script may invoke the string manipulation facilities of awk as an alternative to using its built-in operations. This chapter describes the awk command, a tool with the ability to match lines of text in a file and a set of commands that you can use to manipulate the matched lines. Character,Speech The multitude,The messiah! Show us the messiah! Brians mother,Now you listen here!. vim # run this command with open file in Vim place shell commands in file ; run Open from the main menu and browse to find and select the file. `< file ' is called a redirection since it directs input to come from a different place. When you use perl -pe for a stream operation like perl -pe 's/here is a typi/here is a typo/g' < inputfile > outputfile, Perl allows you to edit the file in place and make a backup of the old version as well. Here is its syntax: substr(s, a, b): it returns b number of chars from string s, starting at position a. This is also the case if length is greater than the number of characters remaining in the string, counting from character number start. It is better known for its column/field manipulation capabilities in a text file. Unless your file is very large, I would suggest updating the text in the file by reading the file, modifying the text, and writing the modified text back to the file. In this case, any file named on the command line is modified in place, so you may want to make a copy of the original before converting it. I want the date in this format: year-month-day-hour-minute-second. For example, to replace the contents of the file in the editing buffer of your current vi session with the first. Back to top Summary: How to use sed to edit many files in place. In most cases, you’ll use the commenting features to provide feedback to a document’s author, but you may also find them useful to write notes to yourself as you’re reading documents. If file already exists, this method opens the file. Replace Text in Plain Text Files from the Command Line Jason Faulkner August 30, 2010, 6:00am EDT A very useful function which is missing from the Windows library of command line tools is the ability to replace text in plain text files. Here $ indicates the last line. Any ideas? Thanks Ryan November 9, 2008 at 10:05 AM Ryan said No problem, with some time and google I got it working with a combination of. grep, awk and sed - three VERY useful command-line utilities Matt Probert, Uni of York grep = global regular expression print In the simplest terms, grep (global regular expression print) will search input files for a search string, and print the lines that match it. It's fast, easy to use, and a great time-saver for programmers and Webmasters in particular. sed '/baz/s/foo/bar/g' file. Sed shows all lines except lines 12 to 18. I am trying to parse a header file and the array size and paste later. Replace files in-place with sed's `-i` flag. Select the cells that you want to search. As a special feature, awk ignores file names that have been replaced with the null string. Replace text values. When the cursor is moved out of the field, and should the field remain empty, the Place Holder text returns. Use it to save files after editing them. 2 Edit , find and replace text in multiple files. In the following article, you'll find an information about how to add some text, character or comma to the beginning or to the end of every line in a file using sed and awk. `awk' prints: Match of fo*bar found at 18 in My program was a foobar Match of Melvin found at 26 in This file created by Melvin. Doing so keeps the original data intact for future use or makes it possible to correct any problems that occur during editing. VisualBasic. The basic process of OCR involves examining the text of a document and translating the characters into code that can be used for data processing. How do I change the text files all in one fell swoop as I would with my trusted Sed? Thanks. This is the second part of a three-part article on the Awk one-liners. Place Section Callout The preferred method for creating sections is with Dynamic Views, by placing a Section Callout: Tools > Detailing Symbols > Place. input' when it encounters a first field with a value equal to 10 in the current input file. Consider this file: line 1 line 2 line 4 As you can see we missed line 3, so to add it just execute this command: sed '3iline 3' filename. In Notepad, can i use the "replace" feature to place a new line / carriage return in a document? I have a large document with thousands of words, about 20 on each line, seperated by 4 spaces - i want to get them so each word is on a seperate line. Note the following : that if the commands are read from a file, trailing whitespace can be fatal, in particular, it will cause scripts to fail for no apparent reason. Awk organizes data into records (which are, by default, lines) and subdivides records into fields (by default separated by spaces or maybe white space (can't remember)). txt --include=*js. Multiple File Search and Replace 2. This step-by-step article describes how to read from and write to a text file by using Visual C#. But I want to show the beauty of awk command which is good at text parsing and even sub strings as well. This assumes the file is not too big. New Jersey American Water will replace approximately 560 feet of aging 6-inch water main and 6,200 feet of aging 8-inch water main in Cherry Hill this fall. In C programming, a string is a sequence of characters terminated with a null character \0. If you need to add a line to a file in Linux, and you need to add that line in a specific position of the file there is an easy solution, even if you need to do it to hundreds of thousands of files. During the series, we wrote small shell scripts, but we didn't mix things up, I think we should take a small step further […]. There are only about sixteen lines that are not commented out or blank. this isn't the place you'll go to if you need technical support as a consumer. This tutorial covers advanced use, tagging, vim plugins and integration with cscope. Ordinary characters such as space, underscore(_), A-Z, a-z, 0-9. In the command mode, every character typed is a command that does something to the text file being edited; a character typed in the command mode may even cause the vi editor to enter the. I'm not sure sed has a way of doing this without reading the whole file into memory. To search the text of an open file for a specific string (combination of characters or words), in the command mode type a colon (:), "s," forward slash (/) and the search string itself. Escaping gives an alternative meaning to the "normal" meaning. JavaScript innerHTML. It functions as a file manager, file converter and page editor. I am thinking of sed's "in -place" replacement feature but this fetuare needs and input file. Newer versions will not have this problem. By manipulating an element's innerHtml you'll be able to change your text and HTML as much as you like. sed is useful in a number of different contexts, including finding and replacing strings of text in a large number of files, manipulating text for Stack Scripts and other kinds of scripts, as well as a component in basic shell scripting. What are Awk one-liners? They are concise and beautiful Awk programs that span no more than 70 characters. Some collection classes are mutable. Unless your file is very large, I would suggest updating the text in the file by reading the file, modifying the text, and writing the modified text back to the file. No point in using the Character version for efficiency (tested with repeating up to 100 000 times). Perhaps you want to place your company logo in the background of a document you’re writing for work, or maybe you need a “confidential” watermark on a document containing sensitive information. Using unsafe code, you can modify a string "in place" after it has been created. The font will be packed together with the drawing file. The PdfDocument is the main class in PDFOne Java. With the sed command and find command you can replace all instances of a word or multiple words in multiple files. For example: { print $1, $2 } The requirement that awk add a trailing to the program argument text is to simplify the grammar, making it match a text file in form. Obtain another copy of the SHX font file and replace it. Doing so keeps the original data intact for future use or makes it possible to correct any problems that occur during editing. Adding comments to a PDF document You can add comments to any PDF file, unless security has been applied to the document to prohibit commenting. I have a text file and I need the replace a special line. This part will explain Awk one-liners for text conversion and substitution. Since strings in Python are immutable, a new string is built with values replaced. Ordinary characters such as space, underscore(_), A-Z, a-z, 0-9. Corrupt font file If the SHX file is in the AutoCAD Fonts folder and the program still does not show the font in the text editor, the file is corrupt or otherwise unreadable by AutoCAD. A character string is one or more characters in succession. There are several reasons why you may want place text over an image in a Word document. Hi, I need to replace an entire line that contains a certain string with another line. All files you select will have the same name followed by a sequential number, per this info from the Windows Help file: To rename a series of files Open My Documents. FNR==NR{a[$1]=$2;next} While reading the first file, this tells awk to create a dictionary a of the translations that we want to do. The basic needs were to delete some files, delete some directories, and to modify selected content of some of the files. If length is not present, this function returns the whole suffix of string that begins at character number start. The base is 10 by default and must be between 2 and 36. Case is significant in command options: the `-F' and `-f' options have nothing to do with each other. Suppose we have a file in which each line is a name followed by a phone number. 38 million investment will continue to advance water service reliability and increase water flows for household consumption and fire protection in this community. Replace String With Awk/Sed Command In Unix: You might have used the Sed Command often to replace the text in file. Adding comments to a PDF document You can add comments to any PDF file, unless security has been applied to the document to prohibit commenting. The double tab with a single tab, the double blank with a single blank, all "006" with "007" and so on. Replace the search string in a project. In addition, previous search strings are stored in the Find/Change dialog box. An extensive list of text processing commands and examples can be found here. Using UNIX tools such as sed (string editor) and awk (named after Aho, Weinberg and Kernigan) are indispensible skills for the Oracle professional on UNIX and Linux. Back to top Summary: How to use sed to edit many files in place. Unfortunately, Duoas is right. I hope these examples of how to use the Unix/Linux sed command to edit files in place has been helpful. From the following article, you’ll learn how to print lines between two patterns in bash. When you develop or support a large website that contains a number of pages and programming code, it is frequently necessary to make a change immediately in many files, add new text or new links in various webpages, change descriptions, key words and other metatags, repair inactive links, and redesign and. All gists Back to GitHub. Fernando Doglio explains basic architecture design, tool selection and code highlights by showing you how to create a text-based UI with the help of Node. You cannot simply replace some lines in the middle of the existing file because the different. If t is not supplied, use $0. I want to change a line like the following : bool SetValues(int array1[30], int array2[30, int size) I want it to look like SetValues(&array1[0], &array2[0], 30). Replace text that you enter or paste into the Input window with the value that you place into the "Find text" field. But I want to show the beauty of awk command which is good at text parsing and even sub strings as well. The build system to use can be select from the Tools/Build System menu. Adobe is on board with Premiere Rush, joined by animation app. history - Command History. sort lines of text files. Doing so keeps the original data intact for future use or makes it possible to correct any problems that occur during editing. old_text is the text that you want to search and replace. The REPLACE function is a built-in function in Excel that is categorized as a String/Text Function. In addition to matching text with the full set of extended regular expressions described in Chapter 1, awk treats each line, or record, as a set of elements, or fields, that can be manipulated individually or in combination. vim # run this command with open file in Vim place shell commands in file ; run Open from the main menu and browse to find and select the file. Firstly, the file content is read via readlines(). Sign in Sign up. For example, you may want to know whether a string contains the word Hello in it. What do we do with them? Let’s roll up our sleeves and use a little style to replace the text with our new image. In this tutorial on Bash scripting, we are going to learn to do comparisons. A few weeks ago, I decided to write my own checkbook balancing program in awk. "awk" is a utility that's useful for processing text files. A text file containing commands which could have been typed directly into the shell. 5, most of the parameters can now. This “Replace text” feature is not case sensitive. However the sed command does not remove the lines from the source file. This is very much like any regular dual. You need to use unsafe code to modify a string in place because the string class is designed as an immutable type. awk -F "\"*,\"*" '{print $3,$1}' file. VI and VIM Linux editor tutorial of advanced editing features and tricks. I'd like to use sed/awk/grep if possible. The user may replace multiple search strings, and load & save lists of search strings for future use, saving time in program data entry. Replace method Apr 30, 2008 03:03 PM | jlglez_armenta | LINK This code is the same of above it was useful for me, in my case i had to read info from a text file and use thenumeric values but some times the info contained chars. First, you're rude when you're wrong. The read file command ( r) reads a file and places its contents in the output before moving to the next command. awk '{print FNR "\t" $0}' files* # precede each line by its line number FOR ALL FILES TOGETHER, with tab. This part will explain Awk one-liners for text conversion and substitution. The basic function of awk is to search files for lines (or other units of text) that contain a pattern. Processing Files In Place With Groovy I recently had the need to process a bunch of files and directory structures that were emitted from a generation process that I didn’t have control over. Linux and Unix systems should have it installed already, while it can be downloaded for Windows. AWK will often treat numbers as strings unless something specifically "numeric" is done with them. To eliminate a file from the middle of the list, store the null string ("") into ARGV in place of the file's name. vi also has a powerful global replacement function. Of course you can do that in Notepad, but not from the command line. This tutorial covers advanced use, tagging, vim plugins and integration with cscope. Usually such patterns are used by string searching algorithms for "find" or "find and replace" operations on strings, or for input validation. That means the method does not replace the characters or strings from a string. All files you select will have the same name followed by a sequential number, per this info from the Windows Help file: To rename a series of files Open My Documents. If str is a single piece of text (either a character vector or a string scalar), then newStr is also a single piece of text of the same type. xml abcd123. txt" with "uboot" and put the output on the screen run: BatchSubstitute. Use keyboard shortcuts or caret codes. To replace all occurrences of a specified value, use the global (g) modifier (see "More Examples" below). And i am trying to copy all of the original file data and place it between the last tag and the end tag of the target file. Solved: Hi all, how can I use awk to print the last character of a given string? I need this to determine what status a server is being reported ie: server1 server2. This is especially good for replacing placeholder values in configuration files. sed 's/foo/bar/4' file. It reads the given file, modifying the input as specified by. Using the Query Editor ribbon: In the Query Editor ribbon, from the Transform tab, select. Suppose if a=guru and b=99 then a+b= "guru99. How do I change the text files all in one fell swoop as I would with my trusted Sed? Thanks. If you would like, you may compress. During the series, we wrote small shell scripts, but we didn’t mix things up, I think we should take a small step further […]. I'm trying to parse files with awk to change their names. An extended awk could at least add new types of patterns, e. So, the lines will be added to the file AT the location where line number matches or BEFORE the line where pattern matches. Here is a collection of short programs that you might find handy and/or instructive:. Let's say the file contains the line "Audrey 5550164. Re: awk difference (RE) between HP-UX and Linux but the options of ERE of gawk isn't possible to use for awk HPUX like r{n,m} with possix :-(( The POSIX shell is no different than ksh or bash. This part will explain Awk one-liners for text conversion and substitution. Left String - Extract characters from the beginning of a string Description: Similar to the Left function in VB a batch script can return a specified number of characters from the left side of a string by specifying a substring for an expansion given a position of 0 and a length using :~ while expanding a variable content. html contains a unique string "PLACEHOLDER" it must be replaced with the contents of file ". Useful one liners and sed notes. grep grep (Global Regular Expression Print) is used. I simply specified the path to all the web files, and ran a command similar to the one below. Find and replace basic text. Unix shell - using TR to replace new lines with spaces. It is a UNIX equivalent to the relational algebra selection operation. This assumes the file is not too big.