hi all,
how do i subract variables in shell ?? am trying to space out the headers and the output generated by the shell so they all line up :

currently the output is like this :


servers : users

server1 : 10
latestServer : 50



so i thought i would keep a constant e.g 40 and subtract the length of the server name from it.

count=${#myserver}; <-- this is the length of the server name
spaces=((40 - $count )); <-- this doesnt really work

thanks in advance.