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--as most other GNU programs do or have some other way of stopping it from interpreting=in a filename asvar=value.gawkdoes understand--as end-of-options like all POSIX awk implementations (awk -- 'code' args) but it doesn't stop arguments with=from being treated as variable assignments. It hasawk -E file.awk argsfor that though (so you can dogawk -e 'code' -E /dev/null other args x=y.txt File*.txt...). But that's gawk-specific.