Re: bash commands

[Ole-Egil Hvitmyren <olegil@samfundet.no>]

Daniel Danu wrote:

> Hi,
>
> Can you tell me please what $$ and $! mean ?
>
> Thanks,
> Dan
>
>
>  

from man bash:

      $      Expands to the process ID of the shell.  In a () subshell, 
it expands to the process ID of the current shell, not the subshell.
      !      Expands to the process ID of the most recently executed 
background (asynchronous) command.


olegil@olegil:$ echo $$
426
olegil@olegil:$ echo $!
31584