This cheat sheet contains:Predefined Variable Summary, which lists all the predefined variables and which awk versions (original awk, nawk or gawk) have it built in, GNU awk’s command line argument summary, I/O statements, Numeric functions, Bit manipulation functions, I18N (internatiolization) functions, String functions, and finally, Time functions.
– http://www.catonmat.netAwk, Nawk and Gawk programming language cheat sheet
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