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• Awk command to print all the lines except the last three lines

  - by Avinash Raj

  I want to print all the lines except the last three lines from the input through awk only. Please note that my file contains n number of lines. For example, file.txt contains, foo bar foobar barfoo last line I want the output to be, foo bar foobar I know it could be possible through the combination of tac and sed or tac and awk $ tac file…

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• problem with awk script

  - by Samantha

  Hello, when I call my awk script, I keep getting an error : sam@sam-laptop:~/shell/td4$ awk -f agenda.awk -- -n Robert agenda.txt awk: agenda.awk:6: printf "Hello" awk: agenda.awk:6: ^ syntax error the script contains this : #!/usr/bin/awk BEGIN { } printf "Hello" END { } Thank you

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• AWK :Extract columns from file: Rows have variable columns

  - by pulikot1

  I have a text file in the following format. Each row has variable number of columns. File: gi|269201691|ref|YP_003280960.1| chromosomal replication initiation protein gi|57651109|ref|YP_184912.1| chromosomal replication initiation protein …

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• Awk to grab colo(u)r codes from CSS files aka School me in Awk

  - by Andrew Bolster

  Nice and (hopefully) easy. I am trying to work out how to grab the variable #XXX from a text file (css file) containing strings like hr { margin: 18px 0 17px; border-color: #ccc; } h1 a:hover, h2 a:hover, h3 a:hover { color: #001100; } Which I would like to return as ccc 777 The plan then is to throw this through sort and…

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• Parsing the output of "uptime" with bash

  - by Keek

  I would like to save the output of the uptime command into a csv file in a Bash script. Since the uptime command has different output formats based on the time since the last reboot I came up with a pretty heavy solution based on case, but there is surely a more elegant way of doing this. uptime output: 8:58AM up 15:12, 1 user, load…

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• how to use ":" as awk field separtor

  - by user173446

  given following command : echo "1: " | awk '/1/ -F ":" {print $1}' why awk outputs : 1:

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• Is it possible to insert data from AWK into MySQL

  - by Mirage

  Can i use mySQL from inside awk code

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• Optimize shell and awk script

  - by bryan

  I am using a combination of a shell script, awk script and a find command to perform multiple text replacements in hundreds of files. The files sizes vary between a few hundred bytes and 20 kbytes. I am looking for a way to speed up this script. I am using cygwin. The shell script - #!/bin/bash if [ $# = 0 ]; then echo "Argument…

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• Parse java console output with awk

  - by Bob Rivers

  Hi, I'm trying to use awk to parse an output generated by a java application, but it isn't working. It seems that the command after the pipe isn't able to get/see the data throwed by the java app. I'm executing the following command (with the return generated by the command): [root@localhost]# java -jar jmxclient.jar usr:pass…

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• Using awk to split text file every 10,000 lines

  - by Sneaky Wombat

  I have a large gzip'd text file. I'd like to something like: zcat BIGFILE.GZ | awk (snag 10,000 lines and redirect to...)|gzip -9 smallerPartFile.gz the awk part up there, I basically want it to take 10,000 lines and send it to gzip and then repeat until all lines in the original input file are consumed. I found a script…

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• Grep and Awk in Windows Invalid Char in Expression Error

  - by Nathan

  I am new to grep and awk - using Windows 7 (I downloaded grep and awk for windows from GnuWin). I am have having trouble running this script: grep -Fwf dictionary.txt frequency.txt | awk '{print $2 "," $1}' I get the error: awk: '{print awk: ^ invalid char ''' in expression I believe it might have something to do with…

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• Bash: Read lines in a file scenario with sed or awk

  - by user105566

  I have this scenarios: File Content: 10.1.1.1 10.1.1.2 10.1.1.3 10.1.1.4 I want sed or awk so that when i cat the file every time new line is returned. like First iteration: cat ip | some magic 10.1.1.1 Second iteration returns 10.1.1.2 Third iteration returns 10.1.1.3 Fourth iteration returns 10.1.1.4 and after…

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• How to solve "Broken Pipe" error when using awk with head

  - by Jon

  I'm getting broken pipe errors from a command that does something like: ls -tr1 /a/path | awk -F '\n' -vpath=/prepend/path/ '{print path$1}' | head -n 50 Essentially I want to list (with absolute path) the oldest X files in a directory. What seems to happen is that the output is correct (I get 50 file paths output) but…

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• Input field separator in awk

  - by Matthijs

  I have many large data files. The delimiter between the fields is a semicolon. However, I have found that there are semicolons in some of the fields, so I cannot simply use the semicolon as a field separator. The following example has 4 fields, but awk sees only 3, because the '1' in field 3 is stripped by the regex…

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• Awk: how to have backclashes in printf?

  - by HH

  Works: awk '{print $$1"\t&\t"$$2"\t\\\\"}' .file > file.tex Does not work, why? awk '{printf %.2f"\t&\t"\.2f"\t\\\\",$$1,$$2}' .file > file.tex Error: awk: {printf %.2f"\t&\t"\.2f"\t\\\\",$1,$2} awk: ^ backslash not last character on line

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• Awk: error in printf but not in print

  - by HH

  Works: awk '{print $$1"\t&\t"$$2"\t\\\\"}' .file > file.tex Does not work, why? awk '{printf %.2f"\t&\t"\.2f"\t\\\\",$$1,$$2}' .file > file.tex Error: awk: {printf %.2f"\t&\t"\.2f"\t\\\\",$1,$2} awk: ^ backslash not last character on line

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• sed/awk or other: one-liner to increment a number by 1 keeping spacing characters

  - by WizardOfOdds

  EDIT: I don't know in advance at which "column" my digits are going to be and I'd like to have a one-liner. Apparently sed doesn't do arithmetic, so maybe a one-liner solution based on awk? I've got a string: (notice the spacing) eh oh 37 and I want it to become: eh oh 36 (so I want to keep the spacing) …

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• OSX, G/AWK, Bash - "illegal statement"

  - by S1syphus

  I have a script that somebody from SO kindly provided to solve an issue I was having, However, I'm having some issues getting it to work on OSX. gawk --version GNU Awk 3.1.6 awk --version awk version 20100208 The original source is: awk -F, -vOFS=, -vc=1 ' NR == 1 { for (i=1; i<NF; i++) { if ($i…

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• Is it worth while to learn Awk?

  - by user41755

  I am decent with bash scripting and I am catching on to regex, and a little sed usage. Is learning awk still worth while with all the alternatives out there. I am kind of averse to using perl, I see it as dying, for some reason I feel like bash is more of a survivor. Opinions?

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• how to change the existing printed line in AWK

  - by manimaran

  Hi, when i execute the following line, its prints the words in newline. awk 'BEGIN { print "line one\nline two\nline three" }' like line one line two line three How can i print the info in the same line with flush the existing line. For example, while executing the loop, it should print 'one' then wipe out the…

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• How to use a variable in an awk expression

  - by lugte098

  I'm trying to make this command: sed bla bla filename | awk '{printf "%s %s_entry_%.3f %.3f %.3f %.3f",$1,$3,$4,$5,$6,$7}' But the thing is, i want the %.3f part to be variable. So in one case it could be %.3f and in another it could be %.3f %.3f %.3f. So i'll just use a static one in my example code for…

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• using Awk inside Perl script

  - by papoyan

  My first question in stackoverflow! I'm having trouble using the following code inside my perl script, any advise is really appreciated, how to correct the syntax? # If I execute in bash, it's working just fine bash$ whois google.com | egrep "\w+([._-]\w)*@\w+([._-]\w)*\.\w{2,4}" |awk ' {for…

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• sed/awk or other: increment a number by 1 keeping spacing characters

  - by WizardOfOdds

  I've got a string: (notice the spacing) eh oh 37 and I want it to become: eh oh 36 (so I want to keep the spacing) Using awk I don't find how to do it, so far I have: echo "eh oh 37" | awk '$3>=0&&$3<=99 {$3--} {print}' But this gives: eh oh 36 (the spacing…

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• Awk filtering values between two files when regions intersect (any solutions welcome)

  - by user964689

  This is building upon an earlier question Awk conditional filter one file based on another (or other solutions) I have an awk program that outputs a column from rows in a text file 'refGene.txt if values in that row match 2 out of 3 values in another text file. I need to include an…

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• Awk: print all other columns but not $1, $2 and $3

  - by HH

  Too cumbersome: awk '{print " "$4" "$5" "$6" "$7" "$8" "$9" "$10" "$11" "$12" "$13}' things

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