subtracting variables in ksh


 
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# 1  
Old 10-09-2008
subtracting variables in ksh

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 :


Code:
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.

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

thanks in advance.
# 2  
Old 10-09-2008
you were almost there Smilie
Code:
spaces=$((40-$count))

# 3  
Old 10-09-2008
((spaces=40-count))
a2156z
# 4  
Old 10-10-2008
Quote:
Originally Posted by a2156z
((spaces=40-count))
That is non-standard. For example:

Code:
$ count=3
$ ((spaces=40-count))
$ printf ":%s:\n" "$spaces"
::
$ spaces=$((40 - $count))
$ printf ":%s:\n" "$spaces"
:37:

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