Programming Forums > Script Programming > Sed and Awk

Ken2 · Jun 17th, 2005, 12:52 PM

Hello,
I would need to add a specific string to the beginning of every line in a document which contains an other specific string, by using Sed or Awk.
I've tried my best to figure out this myself by using examples and tutorials, but I cant find any documentation about this. I did find out how to add something to the beginning of every line (s/^.*/text-to-add/ ), but I didn't manage to convert that so that it would work as i need it.

Ie. If a line contains the string <AB>, i would like to add a the text 'CDE' to the very beginning of that same line.

Im using Sed for Windows, but I asume the commands are almost the same as for Linux.

Thank you in advance,
Ken2

jim mcnamara · Jun 20th, 2005, 9:07 AM

awk solution:

(Toggle Plain Text)

awk ' {if(/AB/) 
       { print "CDE" $0} 
       else 
         {print $0}
       } ' filename

filename contents:

(Toggle Plain Text)

AB
PDQ
PLMAB

output from awk:

(Toggle Plain Text)

CDEAB
PDQ
CDEPLMAB

Ken2 · Jun 20th, 2005, 12:09 PM

Thank you very much

Jun 17th, 2005, 12:52 PM	#1
Ken2 Newbie Join Date: Jun 2005 Posts: 2 Rep Power: 0	Sed, insert string to the beginning of a line Hello, I would need to add a specific string to the beginning of every line in a document which contains an other specific string, by using Sed or Awk. I've tried my best to figure out this myself by using examples and tutorials, but I cant find any documentation about this. I did find out how to add something to the beginning of every line (s/^./text-to-add/ ), but I didn't manage to convert that so that it would work as i need it. Ie. If a line contains the string <AB>, i would like to add a the text 'CDE' to the very beginning of that same line. Im using Sed for Windows, but I asume the commands are almost the same as for Linux. Thank you in advance, Ken2 Last edited by Ken2; Jun 17th, 2005 at 3:20 PM.*

Jun 20th, 2005, 9:07 AM	#2
jim mcnamara Hobbyist Programmer Join Date: Jun 2005 Location: New Mexico Posts: 228 Rep Power: 3	awk solution: (Toggle Plain Text) awk ' {if(/AB/) { print "CDE" $0} else {print $0} } ' filename awk ' {if(/AB/) { print "CDE" $0} else {print $0} } ' filename filename contents: (Toggle Plain Text) AB PDQ PLMAB AB PDQ PLMAB output from awk: (Toggle Plain Text) CDEAB PDQ CDEPLMAB CDEAB PDQ CDEPLMAB

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Jun 20th, 2005, 12:09 PM	#3
Ken2 Newbie Join Date: Jun 2005 Posts: 2 Rep Power: 0	Thank you very much

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Programming Forums > Script Programming > Sed and Awk

Sed, insert string to the beginning of a line