Shell - How to find directory of some command?

Question

I know that when you are on shell, the only commands that can be used are the ones that can be found on some directory set on PATH. Even I don\'t know how to see what dirs a

Answer 1

~$ echo $PATH
/home/jack/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
~$ whereis lshw
lshw: /usr/bin/lshw /usr/share/man/man1/lshw.1.gz