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Grep and sed (replace string in patterned lines)

 
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Old 07-09-2013
Wrench Grep and sed (replace string in patterned lines)
Grep and Sed (replace string in patterned lines)

Hi all,
I want to grep for "PATTERN" and only if "PATTERN" is in a line, this line shall be used as replacement input e.g. for SED.

I don't get it running in one line.

NOT RUNNING - just first idea... I don't know how to redirect grep output to be used by sed in file
Code:
grep "PATTERN" FILENAME | xargs sed 's/ to be changed/, YEHA! to be changed/' [?FILE?]

Input example:
Quote:
This is text
Nothing changes unless PATTERN is found and th replace string.
Now its changed! Because of PATTERN is found... random stuff 1234... to be changed
blah PATTERN 987654321 blub to be changed
nothing to be done - even if to be changed is here
Expected output example:
Quote:
This is text
Nothing changes unless PATTERN is found and th replace string.
Now its changed! Because of PATTERN is found... random stuff 1234... , YEHA! to be changed
blah PATTERN 987654321 blub , YEHA! to be changed
nothing to be done - even if to be changed is here

Thanks a lot!
 
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