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Old 04-16-2005, 11:43 PM   #1
frostillicus
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Registered: Jul 2004
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sed substitution conditional


on lines beginning with echo, globally substitute text with subtext:

sed '/^echo/s/text/subtext/g'

ok, i got that. what i want to do is to wrap ^echo into a not! conditional:

sed '/!(^echo)/s/text/bustext/g'

wondering what the syntax would be to make it like that... i can exclude based on the first character:

sed '/^[^e]/s/text/bustext/g'

but then lines beginning with en, etc., are also excluded. i would like to be able to exclude based on a pattern at the beginning of a line, not just a character. i've tried lostsa syntactical? combinations, nothing seems to work... thanks.
 
Old 04-16-2005, 11:59 PM   #2
frob23
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You're going about it in the right manner but in the wrong place.

Try
Code:
 sed '/^echo/!s/text/subtext/g'
What this does is look at each line, if it starts with "echo" it does NOT replace text with subtext. For those lines which don't start with "echo" it does make the substitution.

I hope this meets your needs.
 
Old 04-17-2005, 12:04 AM   #3
frostillicus
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yes it does, works like a champ. excellent. muchos gracias.
 
Old 04-17-2005, 01:36 AM   #4
frostillicus
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naturally, an hour later i find the exact answer frob gave while looking for something else... the !s syntax is listed in a great sed one-liners file that i already had a copy of..:

http://www.student.northpark.edu/pem...d/sed1line.txt

i had looked, can't believe i missed it. doh...
 
  


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