The search path for finding binaries for commands. Common examples include
When a user or script attempts to run a command, the paths in
$PATH are searched in order to find a matching file with execute permission.
The directories in
$PATH are separated by a
~> $ echo "$PATH" /usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin
So, for example, given the above
$PATH, if you type
lss at the prompt, the shell will look for
/usr/bin/lss, in this order, before concluding that there is no such command.