Modifying sed to only change last occurrence. Post: 302705975

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Top Forums Shell Programming and Scripting Modifying sed to only change last occurrence. Post 302705975 by Don Cragun on Tuesday 25th of September 2012 11:50:18 PM

09-26-2012

Registered User

This is pretty simple using ed (assuming that there is only one pair of colon separated numbers on the last line in out3 that contains a colon and that there are no colons that don't have digits before and after the colon):

Code:

#!/bin/ksh
ed -s out3 <<-EOF
        H
        1s/^//
        ?\([0-9]*\):\([0-9]*\)?s//\2:\1/
        w plotted.p
EOF

I use ksh, but any shell that uses here-documents as specified by the POSIX Standards (including at least bash, ksh, and sh) will work.

Don Cragun

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