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* When printing line number prefix for -n and -b flags, terminate the line number with a tab character * This makes the output compatible with the OpenBSD and GNU versions * Flags -n and -b are not covered in standards document [1] * Line number can be printed directly without modifying the value of line buffer $_ * Now md5sum matches for /bin/cat -n and -b output on my linux system 1. https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cat.html
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