Bash Internal variables $PATH
Example
The search path for finding binaries for commands. Common examples include /usr/bin and /usr/local/bin.
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 : character.
~> $ 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/kerberos/bin/lss, then /usr/local/bin/lss, then /bin/lss, then /usr/bin/lss, in this order, before concluding that there is no such command.
