On 27.03.2011 15:27, jz wrote:
> I cannot figure out what $! does. can someone help?
The $ initiates some expansion, $! is a special shell variable
! The process number of the last background command invoked
or the most recent job put in the background with the bg
There should be a manual installed on you system. Try
or have a look at the original ksh manuals at kornshell.com/doc/