Difference between revisions of "Awk"
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== Examples == | == Examples == | ||
| − | + | get first column from mw table data | |
awk '/\|-/{getline;print}' /tmp/terror.txt | sed s/\|// | sed s/'^ *'// | sort -u | awk '/\|-/{getline;print}' /tmp/terror.txt | sed s/\|// | sed s/'^ *'// | sort -u | ||
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== Docs == | == Docs == | ||
| − | 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 | + | 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]] a PDF copy of the Awk manual |
== One-liners == | == One-liners == | ||
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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 | ||
| − | <center>'''''AWK ( | + | <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''' |
Variable is supported:'''Y''' | Variable is supported:'''Y''' | ||
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| | '''-W lint[=value]--lint[=value]''' | | | '''-W lint[=value]--lint[=value]''' | ||
| − | | | Provide warnings about constructs that are dubious or non-portable to other AWK | + | | | 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''' |
'''Statements and Functions:''' | '''Statements and Functions:''' | ||
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| | '''getline''' | | | '''getline''' | ||
| − | | | Set $0 from next input record; set NF, NR, FNR. Returns 0 on EOF and | + | | | 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. |
