insert a string below another string in a file

I have several files that conatain the string "REPORTCOUNT EVERY 60 MINUTES, RATE" I want to be able to insert another string right below the "REPORTCOUNT EVERY 60 MINUTES, RATE" string.
jko n127Asked:
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perl -pi.bak -e 's/REPORTCOUNT EVERY 60 MINUTES, RATE/REPORTCOUNT EVERY 60 MINUTES, RATE\nAdditionalstring/;' listoffilestoenter

Test first the -i.bak will create a .bak file for everyfile where the match has occurred.
You could do it with sed...(assuming bash here...)

for file in *YourPatternHere*.txt
INSERTION" $file >$file.done

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jko n127Author Commented:
It worked very for me. Thanks
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