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unix sed: delete first ocurrence after pattern

Posted on 2011-02-17
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Last Modified: 2012-05-11
Dear Experts,

In a file I need to delete lines.
Each line in which there is PRIORITY must be removed but only if it is first occurence after the word SCHEDULE.

So if I have this:

SCHEDULE WKS#SOTS-TEST
PRIORITY 85
:
WKS#OTS-EXIT0-CMD
PRIORITY 20
END

SCHEDULE WKS#SOTS-TEST1
ON RUNCYCLE TC TC-SUTH
PRIORITY 70
:
WKS#OTS-EXIT1-CMD
PRIORITY 30
END

Should becomes this...

SCHEDULE WKS#SOTS-TEST
ON RUNCYCLE TC TC-SUTH
:
WKS#OTS-EXIT0-CMD
PRIORITY 20
END

SCHEDULE WKS#SOTS-TEST1
:
WKS#OTS-EXIT1-CMD
PRIORITY 30
END

An other way to see it is that every line that contains PRIORITY between [SCHEDULE] and [:]
is to be deleted.

The goal here is to remove priorities set on schedule level.
Thanks again for your appreciated help.
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Question by:Watnog
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2 Comments
 
LVL 68

Accepted Solution

by:
woolmilkporc earned 2000 total points
ID: 34915317
Hi,

how about (again) awk?

awk '{if ($0~"^SCHEDULE") {SF="Y"}; if ($0~"^:") {SF="N"}; if ($0~"^PRIORITY" && SF=="Y") {} else {print}}' inputfile

Please note that with the above "PRIORITY", the colon ":" and "SCHEDULE" must all start in column 1!
If this is not desired remove "^", like:

awk '{if ($0~"SCHEDULE") {SF="Y"}; if ($0~":") {SF="N"}; if ($0~"PRIORITY" && SF=="Y") {} else {print}}' inputfile

wmp
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Author Closing Comment

by:Watnog
ID: 34915506
Excellent.
Thank you wmp!
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