This example shows that the mytool executable is not in any of the directories in the search path using the which command.
venus% mytool mytool: Command not found venus% which mytool no mytool in /sbin /usr/sbin /usr/bin /etc /home/ignatz/bin . venus% echo $PATH /sbin /usr/sbin /usr/bin /etc /home/ignatz/bin venus% vi ~.cshrc (Add appropriate command directory to the search path) venus% source .cshrc venus% mytool
If you cannot find a command, look at the man page for its directory path. For example, if you cannot find the lpsched command (the lp printer daemon), lpsched(1M) tells you the path is /usr/lib/lp/lpsched.