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* The pod manual doesn't mention reading from standard input * The version on my OpenBSD system prints usage if no arguments are given * Standards document describes file argument as being required (no implicit stdin) [1] * Standards document explicitly says standard input is not used, i.e. no special argument or option to signify stdin * When testing this I discovered invalid option -x did not raise an error, so add error handling * Below output is from my linux system: two of the file arguments have patterns to display 1. https://pubs.opengroup.org/onlinepubs/009696799/utilities/what.html %perl what /bin/gprof /bin/bash /bin/echo /bin/gprof: Copyright (c) 1983 Regents of the University of California. /bin/bash: Bash version 5.1.4(1) release GNU /bin/echo:
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