Difference between revisions of "Awk"

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== Examples ==
 
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; get first column from mw table data
 
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awk '/\|-/{getline;print}' /tmp/terror.txt | sed s/\|// | sed s/'^ *'// | sort -u
 
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; see who's trying to SSH into your server (brute force attack)
 
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awk '/Invalid user/ {print $8}' /var/log/auth.log | sort | uniq -c
 
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== Docs ==
 
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The man page for Awk is 27 pages long.  Hard to read in a terminal.  Here is [[File:Awk.pdf|a PDF copy of the Awk manual|thumb]] a PDF copy of the Awk manual
 
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== One-liners ==
 
== One-liners ==
 
<pre>
 
<pre>
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http://www.catonmat.net/blog/wp-content/plugins/wp-downloadMonitor/user_uploads/awk.cheat.sheet.pdf
 
http://www.catonmat.net/blog/wp-content/plugins/wp-downloadMonitor/user_uploads/awk.cheat.sheet.pdf
  
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<center>'''''AWK ([[wp:Alfred_Aho|Aho]], [[wp:Peter_J._Weinberger|Weinberger]], & [[wp:Brian_Kernighan|Kernighan]]) Summary'''''</center>
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<center>'''''AWK (Aho, Kernighan, and Weinberger) Summary'''''</center>
  
  
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'''� 2007 Peteris Krumins peter@catonmat.net[http://www.catonmat.net/ http://www.catonmat.net] good coders code, great reuse'''
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'''2007 Peteris Krumins peter@catonmat.net[http://www.catonmat.net/ http://www.catonmat.net] good coders code, great reuse'''
  
 
Variable is supported:'''Y'''
 
Variable is supported:'''Y'''
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| | '''-W lint[=value]--lint[=value]'''
 
| | '''-W lint[=value]--lint[=value]'''
  
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| | Provide warnings about constructs that are dubious or non-portable to other AWK impl�s. With argument '''fatal''', lint warnings become fatal errors. With an optional argument of '''invalid''', only warnings about things that are actually invalid are issued. (This is not fully implemented yet.)
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| | Provide warnings about constructs that are dubious or non-portable to other AWK . With argument '''fatal''', lint warnings become fatal errors. With an optional argument of '''invalid''', only warnings about things that are actually invalid are issued. (This is not fully implemented yet.)
  
 
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'''� 2007 Peteris Krumins peter@catonmat.net[http://www.catonmat.net/ http://www.catonmat.net] good coders code, great reuse'''
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'''2007 Peteris Krumins peter@catonmat.net[http://www.catonmat.net/ http://www.catonmat.net] good coders code, great reuse'''
  
 
'''Statements and Functions:'''
 
'''Statements and Functions:'''
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|-
 
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| | '''getline'''
 
| | '''getline'''
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| | Set $0 from next input record; set NF, NR, FNR. Returns 0 on EOF and �1 on an error. Upon an error, ERRNO contains a string describing the problem.  
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| | Set $0 from next input record; set NF, NR, FNR. Returns 0 on EOF and on an error. Upon an error, ERRNO contains a string describing the problem.  
  
  

Revision as of 00:50, 30 January 2017

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