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Shell Programming and Scripting

Reading UNIX commands from file and redirecting output to a file

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# 8  
Old 07-13-2011
Quote:
Originally Posted by rahulparo
My objective is to store the o/p of the command in a variable and do ceratin operations on it. It works fine if i just ls but not working with pipe...
If the operations are limited within the loop, you could just skip the "commands.txt" stuff.


Code:
ps -ef | grep abc | grep xyz |awk '{print $2} | while read pid
do 
  echo $pid
done

You might need to handle the variable scoping (subshell) if needed outside the loop.
# 9  
Old 07-13-2011
eval "$cmdline" works.

Why there is need of special syntax eval pid=\?($cmdline)
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