TITLE A2osX which (bin/which) Command Help which -- locate a program file in the user's path SYNOPSIS which program ... DESCRIPTION The which utility takes a list of command names and searches the path for each and will report back which specific executable would have been picked up if the command was actually run. The which utility accepts the following options: -a List all instances found instead of just the first one. -s No output, just return 0 if all programs are found, or 1 if some were not found. PAGE EXAMPLES Locate the cp and ls commands: # which cp ls /FULL32/bin/cp /FULL32/bin/ls Do not show output, just return code: # which -s seq # echo $? 0 # which -s fakecmd # echo $? 1 HISTORY The which command first appeared in FreeBSD 2.1 and was a Perl script written by Wolfram Schneider . The A2osX which command was developed by Brian J. Bernstein in Dec 2022.