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Request ID GMDCOM TIME GMDRRS TIME COM-RRS
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<36812974> Tue Oct 1 13:32:40 2013 Tue Oct 1 20:36:42 2013
<36812985> Tue Oct 1 13:37:38 2013 Tue Oct 1 20:05:07 2013
<36812986> Tue Oct 1 13:37:53 2013 Tue Oct 1 20:29:29 2013
<36812987> Tue Oct 1 13:37:54 2013 Tue Oct 1 20:18:30 2013
How do i calculate the difference between GMDCOM TIME and GMDRRS TIME in hh:mm:ss format and display under COM-RRS column.?
I dont want to use AWK, PERL, SED etc. to do it. But normal bash shell scipting command to do it.