What is the meaning for $! in shell? I am trying to understand a script. And it has the following sequence of commands.
Code:
local@usr> a=1
local@usr> echo $a
1
local@usr> echo $!a
a
It is printing the variable back. Is it all for that? What are the other $x option you have? Few I know are $$, $*, $?. If anyone can point me to a good source, it will be helpful.