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<h1 style="font-size: 12em;"><b>Awk substitute example. Convert this: "steve john" to: .</b></h1>
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<h2>Awk substitute example. Can anyone see what I am missing here? Any help would be.</h2>
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<div class="sp-block-content" style="max-width: 800px;">Awk substitute example You need to set the FS to the newline (\n) and the RS to a blank text, so empty lines will be considered 101, NewName, NewPlan 102, NewName, NewPlan 103, NewName, NewPlan In this command, $2="NewName" and $3="NewPlan" instruct awk to set the second and third columns to NewName and NewPlan respectively. json > output. The I thought I'd pipe the tail to awk and do a simple replace, however I cannot seem to escape the newline in the regex. So just one awk command will do. Z , . txt 123 linux linux linux linux /bin/bash Ubuntu linuxbar 456 If you want to find and replace a string that contains the delimiter character (/) you’ll need to use the backslash (\) to escape the slash. With an awk script in a file, you would use it like. 9. The difference between them is that gsub() performs its substitution globally on the input string whereas sub() makes only the first possible substitution. awk print column $3 if $2==a specific value? awk partly string match (if column partly matches) Sed pattern to match and replace. It sounds like you want to do this instead: awk '{ print "letter is", $1 }' raw. It will produce the same output that you saw previously. Brian Brian. Comments are hard to read, easy to miss and can be deleted without warning. AWK Multiple substitute. awk. /\,/g' file how can I use sed or preferably awk to only apply this for the second column, so my output would look like this: One option is to enclose the program with double instead of single quotes and substitute the variable in the program. sed 's:ABC:DEF:g' is equivalent for. The ‘s’ command in sed stands for substitute, followed by the text to find awk -f example. json. In the Dictionary examples above, have used <space> to indicate the 'symbol' between words and after a comma. $ awk -v dummy='0123456789' -v start=314 -v len=10 ' { print substr($0, 1, start-1) dummy substr($0, start+len) }' infile >outfile testing: awk replace field value based Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company AWK Command Examples. Is there an awk function which will find only an exact match (and replace) of an entire field; for all fields. Linux Bash Script Awk Field Separator. For example the DISPLAY in this system is {{env DISPLAY}} and the path is {{env PATH}}. Hi Change apple orange guava mango banana orange It's hot outside Change tom greg fred harry steve fred George is a cool guy Change mary lucy becky karly jill karly thank you In all the lines that has pattern "Change", I want to replace the last word, for example "orange" in second line, with say, pear. conf dataload 23 server 25 inputrc } I just want to replace the server vaule. b I have tried with awk but I have only managed to position myself relative to the beginning of the line. In our previous sed articles we learned — sed printing, sed deletion, sed substitute , sed file write, and sed multiple commands. Like any other programming languages, Awk also has user defined variables and built-in variables. – mikeserv This worked for me, and my case was find/replacing IP address values. Some of the lines may have initial spaces. Community Bot. txt|1230 I want the output to be . they don't answer my full question. ORS="\n" ##Setting the value of ORS(output record separator) as new line here. fasta file; first pass through the while loop the first old/new pattern will be replaced and the output file will be created; on the 2nd pass through the while loop the second old/new pattern will be replaced (from the I want to replace all dots . Follow edited May 23, 2017 at 10:27. To do this I wrote the code below, but it feels like there is a more elegant solution then calling gawk twice. , I want to replace (\d+)\" with \1+10\", where \1 is the group representing (\d+). Another option for a substitution this simple would be to use sed: $ sed '/^>/s/ /A /' file. What is the easiest way to substitute regular expression by AWK script? My goal is to search pattern: /a|b/ in sentence: I read a book "GAWK: Effective AWK Programming", but I can not figure it out. Perhaps I should use AWK rather than stream editor? Don't do that, just replace the original water heater with one better water heater. Hot Network Questions Lines in Coloumn Is it possible to shrink back a GoPro battery? Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company, and our products this line may do what you want: awk -F'|' -v OFS="|" 'NR==1{$4="Visit our website!"}1' file in your awk codes: you have had FS to separate the fields, you don't need the sub func. For example to replace /bin/bash with /usr/bin/zsh you How can I remove a space located between name and lastname from a string by using awk? most of the examples are about redirecting data from command line to awk but I need to manipulate a string inside an awk script. When you write. ; even if with sub( ) function, your syntax is not correct. z , _z , -gz , -z , . ) Assume Example: try. 1234,active 5678,inactive 9101,active 1213,inactive 1415,active To replace the 3rd line of this file, you can use the following awk command:. Replace multiple arguments with gsub. The only thing other thing I can think of is this: In this tutorial, you’ll learn how to use awk gensub function to replace text using regex capturing groups. I suspect because the command is finding occurrences of X: as a whole character rather than as part of a string. 4 min read. I want to replace only: AA with A A CC with C C GG with G G TT with T T AC with A C GC with G C and so on. 3. We’ll use a here document to create this test file quickly: Let’s look at how awk performs find-and-replace operations on our sample file using the gsub command: $ awk '{gsub(/i/,"a"); print}' test. It is very hard to help you parse data if you do not show us what we are supposed to parse. awk sub with a capturing trying to do a gsub in awk. The more of the <p A replacement string to substitute for the XML you matched. genehunter: I only want to change the occurrence of X: into 23: Therefore, for my example, the output should look like this: I tried the command below but it didn't work. txt This command uses awk gsub function to globally substitute PlanA with PlanB. 4. Update 2: Okay, so your input is extremely difficult to process. Both functions take at least two arguments. I often use awk to handle structured data, especially with CSV files, where calculations on selected fields might be needed. e. asked Jul 27 Use "weak quotes" rather than 'strong quotes' for subshell expansion to happen within an awk script, but doing so in your example would not be a Replace Text Using awk Command Like sed, awk also performs simple to advanced text manipulation. stackexchange — for getting answers to pertinent questions on awk and related commands tex. BTW, thanks for the info, this was new to me :) – slayedbylucifer. This is being called from bash. txt I have the below file cat log. and substitute it with: ABC/a|b/ABC So result will be: I reABCaABCd ABCaABC ABCbABCook "GAWK: Effective AWK ProgrABCaABCmming", but I cABCaABCn not figure it This is the second part of a three-part article on the Awk one-liners. Although awk is well-known for managing structured data, it's also effective for quick find-and-replace tasks. stackexchange — for help on pandoc and tex related questions This article is part of the on-going Awk Tutorial and Examples series. $ sed -i 's/word_1/word_2/g' myfile. Convert this: "steve john" to: The following command basically does a global substitution of a regular expression (a single space in this you can use -v option of awk to pass in variable from the shell #!/bin/bash awk -v values="${values}" '{gsub("blah","replace");printf "%s %s_entry_"values . Ternary expressions are the shorthand version of the if-else statement of the Awk. gz , . I tried a basic sed command to find and replace it but it didn't work. g. Search and replace one line with multiple lines in a unix script. 4-65KB) in order to get better performance (by reducing disk I/O. The question is: How to improve or replace my simple awk scripts with scripts that process the longer strings on multiple lines?. awk -F" +" 'NF > 1 {gsub(/[[:alnum:]][ ][[:alnum:]]/, "_")}1' file Input: this is example ca bc dec cat 251 otg op con this is what I get: this is example ca bc de_at 251 otg o_on Desired output: this is example ca bc dec_cat 251 otg op_con awk; Share. You can also use awk to perform more complex operations, such as filtering and transforming data. What have you tried? – ghoti. This part will explain Awk one-liners for text conversion and substitution. txt contains: Please edit your question and add i) an example input file and ii) the output you want from that file. However, this option will make your awk program more complex as you must escape the awk variables. But it doesn't For example, the following shows how to replace the first ‘|’ on each line with an ‘&’: { sub(/\|/, "\\&"); print } As mentioned, the third argument to sub() must be a variable, field, or array element. Arrays are an extension of variables. It makes the substitution, then returns the full variable(s). In this case just add BEGIN{FS=OFS="\t"} at the front of your awk script so awk knows your input and output are tab-delimited. sed - Search and Replace Multiple Line. This is a one page quick reference cheat sheet to the GNU awk, which covers commonly used awk expressions and . If the bb was searched for then we would have 2 max occurrences (one could say that as soon as the first bb was found, it would be replaced). And by using single quotes, you won't have to do a bunch of unnecessary escaping. txt with the following content:. If you'd like, you can create an awk program that will output data totally unrelated to the input data. Awk provides two substitution functions: sub() and gsub(). awk insists that you tell it that you've changed FIELDWIDTHS by calling fieldwidth_set(). Question for the gallery, though: Why are the dots escaped for the first subdomainA\. We’ll explore AWK’s core functionality, delve into its advanced features, and even discuss common issues and their solutions. 1. AWK - replace with sub match. Example 1: Print Contents of a File. {} <pattern 1> {<program actions>} . 3 Substitution Functions. awk method. Let's use an example: Example regular expression: Here’s how to do it using awk: awk '{gsub(/PlanA/, "PlanB"); print}' file1. }' file the gsub() function is to replace what you have with that sed command. Share. Follow edited Jul 27, 2017 at 21:03. If, for a given record (“line”) of the input file, the pattern evaluates to a non-zero value (equivalent to “true” in AWK), the com In this tutorial, we’ll explore various aspects of the gsub function, including basic substitutions, regular expression matching, in-place editing workaround, case-insensitive substitutions, and dynamic replacements. Add a Replace By Line Number. Improve this answer. But in my case, I have a regular expression that I want to run against a text file to extract a specific value. I'm an awk newbie, so please bear with me. In awk, the $0 variable represents the entire current line, so print and print $0 do exactly the same thing. txt. Replace specific values with sed. If the third parameter is From the awk man page: For each substring matching the regular expression r in the string t, substitute the string s, and return the number of substitutions. Modified 8 years, 1 month ago. txt But, if the {} braces are missing, awk prints the line if the test is true. txt" from my file using sub and awk. awk introduction; 4. The correct way to pass shell variables into an AWK program is to use AWK's variable passing feature instead of trying to embed the shell variable. awk -v FIELDWIDTHS="5 2 6 2 999" -v OFS= -f fw. Commented Jun 17, 2015 at 21:18. Record separators; 7. While this will not necessarily keep the exact input formatting, you will get consistently tab-separated output. And don't use input redirection as it blocks awk from using FILENAME and isn't extensible to 2 or See an example: Given this file: $ cat file hello this is a var hello bye Let's look for lines containing "hello": $ awk '/hello/' file hello hello bye Let's now try looking for "pat", contained in a variable, the way you were doing it: $ awk -v pat="hello" '/pat/' file $ # NO MATCHES! awk -F "," '{print $35}' test. txt: John\nDoe Sara\nConnor cat test. 1,667 12 12 silver badges 17 17 bronze badges. txt > temp. /" and ". I don't want to do search-and-replace. Using awk to replace text between two strings or patterns. @Underverse - I don't think that's the same thing. * { dbset quotatab rsyslog. Example output: This is a basic templating system that can replace environment variables in regular text files. Parsing CSV with AWK, I want to replace X's from lines 2-4, to "A" with awk or whatever, so output should be: ATO N X B AT H1 A BT ATOM H25 A BAA ATOM H3 A BUTZ ATOM CA X BAT I emphasize that X (or its substitute A) is 11th "entity" (including characters or spaces) in line, and should stay 11th "entity" in output, and every other "entity" should stay on its place as in original file. com value but not for the second sudomainB. txt && mv temp. How to properly find and replace a multiline text using sed or awk? 2. The text shows This guide will walk you through practical examples of using AWK, from basic to advanced scenarios. Can anyone see what I am missing here? Any help would be What does if the blank column changes in other example from 3rd to xyz then have to change the same in command again mean then? It sounds like you're saying with that sentence that you want to change any blank column, but then you also say the replace should work only for those rows in which value of 3rd column is blank which means only the 3rd column should be For example, this awk command prints any record containing an r character: $ awk -e '$1 ~ /r/ {print $0}' colours. The empty string is found between each character and after the last one, so awk inserts a b after each f. If the string was bbbb and b was searched for then we would have 4 occurrences. ) I learned a nice way to make the first letter of every word uppercase from another post on this website using the following awk command: Replace string in upper or lower case with Awk. So ex. echo "fffff"|awk '{gsub('f', "b")}1' what awk sees is {gsub(f, "b")}1. To replace the third column with “Premium” for “Basic” plans and print all rows. Regex capturing groups allow you to match specific patterns within a text and replace or manipulate these captured segments. More Bonus Tip: Use the ternary operator instead. Conditional Column Replacement. awk input. awk -f <(echo '{$2=$4;print}') (Assuming you put the fieldwidth snippet into fw. BEGIN { print "\n>>>Start" } Let’s look at how awk performs find-and-replace operations on our test. I want to reformat the following: Code: ID1 ID001 0 0 2 1 GG TC GG CT GG AA AA AG ID2 ID002 0 0 2 2 GG 00 AG CC GG GG TC CC. As part of our on-going awk examples series, we have seen awk user defined variables and awk built-in variables. I found a solution but only works only with pattern, doesn't work with substitution. So far, I have had the most success with this command, I would like to have in the code the number of the index from where to start the substitution, (here, for example, is 5) and the length number of the substitution ( here 4), so I can just modify these numbers in case I want to start in another position and for a different length of substitutions because in reality, I have a string with Awk programming language supports arrays. Rest of my code is working except this . Regex match and replace. – Sparhawk. awk 'NR==3 {$0="9101,updated"} 1' customer_data. gawk gensub regex, how do I replace one or more, with back to back similar capture groups. }; 1; ##By mentioning 1 here I am making condition TRUE here and not mentioning any action so by default print of current line will happen. txt file1. tgz and replace the compressed file with the original file by default. awk datafile If the awk variable INPLACE_SUFFIX is set to a string, then the library would make a backup of the original file with that as a filename suffix. Is there a way to index $2 and $3 from a specific match, for instance? can 00 00 occur more than once in a line? could a line contain 00 00 00 and if so then do we replace based on the leading 00 00 or the trailing 00 00? If any of these scenarios can occur then Here are some additional examples showcasing the usage of Sed and Awk in Linux command line: Sed Examples Replace the word “apple” with “orange” in a file:. This makes gsub() equivalent to the sed substitution command with the g (global) flag. The 1 at the end is awk short-hand that says "print the current line". json For example, to change "North" to "N": $ sed -i 's/North/N/g' myfile. txt /root/logs/*. com value? I executed it in the suggested format, and it seemed to do the job perfectly, but I'm curious why the escaping is only presented for the first string pattern. Here is our resulting output: Thas as a sample fale created an 2020 to demonstrate character In the above example, the awk command prints all the line which matches with the ‘manager’. In this example it will append fileB after my marker Put this script in a file (say dequote. Here's how to do it − Example 9: Replace a String in a File. But missing braces is printing the whole like, so it's just awk '1'. How to remove anything enclosed in : from a text? Hot Network Questions Example based guide to mastering GNU awk. replacing multi-line string with sed. The simplest use of AWK command is to print contents of a file to console. Can anyone tell me if the @Philippos thank you for the question. I'm afraid most of the commands you're using won't work, and I can't help you get the right commands if you don't explain what you expect the commands to do. Syn. In the example below we are using both the g and I flags: sed -i 's/foo/linux/gI' file. This is what my input looks in file . com"; } I have tried with sed and awk (gsub) but I have issues with the return/unescaped character. It interprets f as a variable, with an empty value, and substitutes every empty string in the input with b. The command. This probably means that a solution should use \t for FS in both the Dictionary file and the Input file. 2. SUB function allows to substitute text inside awk. gsub ( "[. Follow asked Jun 17, 2015 at 21:11. I would like to have in the code the number of the index from where to start the substitution, (here, for example, is 4) and the length number of the substitution ( here also 4), so I can just modify these numbers in case I want to start in another position and for a different length of substitution because in reality, I have a string with thousands of letter and I want to replace Assuming more than one old/new pattern pair to replace, I see one issue with the current code; for discussion puposes assume 2 old/new patterns and one *. awk -v replace='81115' -v OFS='\t' '{$5=replace}1' file Note the absence of the -F option so as to rely on Awk's default field-splitting behavior. csv | sed -i 's/^0/+91/g' so, I am pulling the 35th entry using awk and then replacing the "0" in the starting position in the string with "+91". Here I'm demonstrating my problem with cat instead of tail: test. if you want to filter lines with first column equal to 1, you could awk '$1 == 42{print;}' or just awk '$1 == 42'. Preface; 2. There are a few methods you could use. For example, /foo/bar stays the same, but /foo/bar/1 becomes /foo/bar. It accepts all the files having extension as . You can substitute // or "" for the same effect, without an unused variable:. In some programming languages, In this tutorial, you’ll learn how to replace multiple lines using awk in Linux. Replace last two occurences of commas with dots. print $35 '} test. In this article let us review how to define and When dealing with the following example: echo "1: " | awk '/1/ -F ":" {print $1}' The syntax is messy and the interpreter chose to ignore the part F ": Replace end of line with ':' at the end to one liner (SED or AWK or other) 0. Please help Thanks I have been reading up on awk gsub, but cant figure it out. That should prefix the 35th char on an input line w/ the char $ - delimited or not. In-place file editing Instead of using a range, you could make the pattern more specific for the example data matching 1 or more alphanumeric chars or -or _ in between using [[:alnum:]_-]\+ and replace the match(es) with zzz Using awk, I want to print all lines that have a string in the first column that starts with 22_ I tried the following, but obviously * does not work as a wildcard in awk: awk '$1=="22_*" {print First, you can use another character as the s/// delimiter. Viewed 4k times The above is obviously fragile and can fail if, for example <p can appear in [Text_between_brackets]. sub(regexp, replacement, target) where regexp could be a full regular expression $ cat file AAAAA BBBB CCCC DDDD EEEE FFFF GGGG $ awk '{sub("AAA","XXX", $0); print}' file XXXAA BBBB CCCC DDDD EEEE For awk: You must use the gsub function for global line substitution (more than one substitution). I see nothing wrong with this solution. <pattern 2> {<program actions>} . I want to replace single space with underscore, but the adjoining characters are replaced. Replace the content of a specific column with sed/awk. txt Here is another awk example that does exactly the same thing: $ awk '{ print $0 }' /etc/passwd. The {print $2} action tells awk to print the second field of each line. bash; awk; Share. txt strawberry red 3 raspberry red 99 grape purple 10 These are functions, just like print and printf, and can be @AleksandrLevchuk Your example works exactly as expected. If you edit, you can use the [format] to make sure everything is clear. The syntax: gsub(regexp, replacement [, target]) . To replace a string in a file using AWK sed/awk replace a specific pattern under another pattern. taz or . This article is part of the on-going Unix Sed Tips and Tricks series. /txt]","" ) In this example, the -F',' option tells awk to use the comma , as the field separator. txt This works by running the command in curly braces on all lines that match the regular expression ^>. Arrays are variable that hold more than one value. The files after uncompression retain its actual extension. 1 1 1 silver badge. The Here is my solution by using GNU AWK and regex: awk -F'#' 'NF>1{gsub(/"(\d+)\""/, "\1+11\"")}' i. (To keep the example simple, "word" is defined here as strictly alphabetic characters; all others are considered separators. because your line starting with |; if you want to In awk, the following should work: $ awk '/^>/ {$1=$1"A"} 1' file. What are Awk one-liners? They are concise and beautiful Awk programs that span no more than 70 characters (less than one terminal line). A_place = 10km B_place=5km #A_place=2km C_place=1km I want to change the A_place value in the uncommented line. We will cover how to replace multiple lines, handle nested blocks, work with patterns, and more. /file_name. txt | awk -F'\\n' '{ print $1 "\n" $2 }' Here is a real world example dealing with aws iam embeded json policy in the output, the file file. For example, to replace I want to replace that {here} by the content of another file B: location /blah { proxy_pass "https://blah. in the second column with a comma , as I would with sed 's/\. sed is redundant in this case (and most other cases where awk is used) I want to replace @@ with ^ and ¤¤ with a newline in a file. echo I have some configuration file like example. Field separators; 6. csv and it does the substitution on the console It does not write the change to the file. The line saying there is not kept as the program does not output it. We’ll explore cases where gensub is more This is a one page quick reference cheat sheet to the GNU awk, which covers commonly used awk expressions and commands. I will use the output of this gsub and pass it to awk and print it. For example, the following: I want to remove characters ". example\. You can also use awk as such: If I'd like to replace a character field, say {, with awk I can use: awk '{ gsub(/{/, "<"); print }' file but this will also replace a field such as "{" (which I don't want). and NF{ ##Checking if value of awk out of the box variable named NF value is NULL here, if yes then do following. In this article, let us review some interesting workarounds with the “s” substitute command in sed with several practical examples. #Example awk ' BEGIN { print "\n>>>Start"} !/(login|shutdown)/ Substitute t for first occurrence of regex r in The following should work to replace all instances of word_1 to word_2 in myfile. awk students. Thanks. replace a string with sed from specific lines. Commented Jun 21, 2012 at 12:55. I am struggling with awk substitution, for some reason the following code does not substitute anything, it just prints the output unaltered. ") to set FIELDWIDTHS to a new value. How to I do this in awk? unix; awk; substring; substr; Share. ZIP command in Linux with examples ZIP is a The question is specifically about how to leverage command substitution in AWK programs. Expected output via standard output: This is a basic templating system that can replace environment variables in regular text files. 2. Just to clarify the data loss aspect: when awk (or sed) start processing a file and you ask them to read the first line, they will actually perform a buffered read, that is, they will read from the filesystem (let's simplify and say "from disk") a block of data as large as their internal read buffer (e. csv James,Jones,30,Mr,Main St Melissa,Greene,200,Mrs,Wall St Robert,Krupp,410,Mr,Random St Please edit your question to add more information. Ask Question Asked 8 years, 1 month ago. The thing above should affix the 35th occurrence of any number of delimiter chars - in other words, the 35th field - with the char $ - no matter how chars are in each field. It will work with GNU awk as Let’s begin by creating a test file to use in our examples. In this tutorial, you’ll learn various aspects of gensub in awk, how to substitute strings, use backreferences, perform global and limited replacements, and use dynamic regex patterns. awk) and run the script with awk -f dequote. If t is not supplied, This example is mostly useless, but it will nevertheless be a good introduction the AWK syntax: AWK programs are made of one or many pattern { action }statements. Im trying to make a substitution of a single line in a file with awk, for example. Imagine you have a file named customer_data. See part one for introduction of the series. replace specific characters containing "\" character with sed. Here's an example: $ awk '{ print "" }' /etc/passwd. In the above example, awk fails to process fields properly because the fields are separated by newlines and not spaces. , just set $3 directly. txt sample file: $ awk '{sub(/{OLD_TERM}/,{NEW_TERM}); print}' {file} In this statement, we’re invoking First time attempting to tinker with AWK and use it to take input from a file like the following: data. How to use As you can see, this makes the output of the awk code replace the input file. Instead of using if else statements in awk, you can also use the ternary operator. In this example, we’re using sed to replace ‘apple’ with ‘pear’. Regular Expressions; 5. Improve this question. After the substitution, the output is redirected to a temporary file temp. awk -i inplace -f script. example. Marcus Junius Brutus. Now that we understand basic syntax and functions of AWK command, let's look at some examples of how it can be used. file_name|1230 So far This is what I have written. If the condition is true then command1 will execute; @Luuk having looked at it now, it won't work in any awk because sub($4,b[2]), for example, won't replace $4 with b[2], it'll replace the first string that matches the regexp described by $4 with b[2] so it could replace part/all of $3 if it matches a regexp described by $4. Installation and Documentation; 3. here it is 25. json Note that the -i flag will invoke in-place editing and as such data will immediately be changed. ) For efficiency, fw. For example, let's print the name and department of people older than 30: awk -F',' '$2 > 30 {print $1, $3}' data. It is, so the default action prints each line. Also, search/replace should not be recursive (for example where the replace string would be bbb Use sed/awk to replace text in multiple lines at once. Similar to variables, arrays also has names. Example. Then, mv is used to replace the original file with the updated one. To print every line you could awk '1{print}' or just awk '{print}'. 0. . Commented Oct 28, 2016 at 4:17. changing this: e1 is (on) e2 is (off) to: e1 is (on) e2 is (on) use command: awk '/e2/{gsub(/off/, "on")};{print}' ~/Documents/Prueba > ~/Documents/Prueba this makes the substitution but the file ends blank! GNU awk documentation — manual and examples stackoverflow and unix. Or you can use set_fieldwidth(". Show more. you can get detail info by man gawk; it is actually not $3, it is $4. sed 's/ABC/DEF/g' It will make your command more I see lots of examples and man pages on how to do things like search-and-replace using sed, awk, or gawk. Cover; Buy PDF/EPUB versions; 1. Table of Contents hide At the moment, you have no { action } block, so your condition evaluates the two empty variables this and is, concatenating them with the first field $1, and checks whether the result is true (a non-empty string). 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