search a pattern and if pattern found insert new pattern at the begining

pitagi · February 12, 2009, 2:06pm

I am trying to do some thing like this ..

In a file , if pattern found insert new pattern at the begining of the line containing the pattern.

example:
in a file I have this.
gtrow0unit1/gctunit_crrownorth_stage5_outnet_feedthru_pin[9:0]

if i find feedthru_pin want to insert !! at the begining of this line

Can some one help?

jim_mcnamara · February 12, 2009, 2:13pm

one way

awk ' if(index($0,"feedthru_pin")>0) {printf("!!")}
        print $0 ' infile > outfile

vgersh99 · February 12, 2009, 2:18pm

sed '/feedthru_pin/ s#.*#!!&#' infile > outfile

pitagi · February 12, 2009, 2:30pm

thanks .. I used sed command it replaces with previous command

ls-VEC(VERILOG) gtfix11/avs_cs_done_cs_feedthru_pin[1:1];

ls was my previous command.

should I try

sed '/feedthru_pin/ s#.*#'!!'&#' infile > outfile

vgersh99 · February 12, 2009, 2:38pm

Are you asking something?
I'm confused by the latest post....

pitagi · February 12, 2009, 2:41pm

yes. I tried this.

sed '/feedthru_pin/ s#.*#'!!'&#' infile > outfile does not work.

vgersh99 · February 12, 2009, 2:46pm

I don't think this is what I put in post - please re-read.
Also for the future, please try elaborating on 'does not work'.

summer_cherry · February 12, 2009, 9:27pm

echo "This is a test file" | sed '/test/{
 s/^/!!/
}'