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Archive of posts filed under the awk category.

Obfuscated awk

Awk obfuscated code

“In-place” editing of files

Temporary files don't bite, so just use them.

Print lines in reverse order

Some silly ways to print lines in reverse order

Joining files with awk

Join lines from files based on keys

Awk pitfall: string concatenation

This is a bit of a dark corner of awk. This beast is string concatenation. There is a classical example in the awk FAQ number 28: $ awk 'BEGIN { print 6 " " -22 }' 6-22 Where did the space go? First, " " -22 is evaluated, in numeric context, yielding 0-22 = -22. […]