sed search and replace

d__browne · #1 (**permalink**) 04-26-2006

Hello Folks,

Anyone know how I can replace this line in file.xml

<oacore_nprocs oa_var="s_oacore_nprocs">8</oacore_nprocs>

with this line

<oacore_nprocs oa_var="s_oacore_nprocs">1</oacore_nprocs>

using sed or awk ?

Thanks for your time.

Cheers,

Dave

vino · #2 (**permalink**) 04-26-2006

Code:

sed -e "s/\(<oacore_nprocs [^>]*>\)[^<]*\(<.*\)/\1SOME-TEXT-TO-GO-IN\2/g"

The sed expression could get simpler. But this one would take anything between the tags and replace it with SOME-TEXT-TO-GO-IN.

d__browne · #3 (**permalink**) 04-26-2006

Hi thanks for the reply.
I'm not sure I understand the command, I just need to replace the 8 with the 1 on that particular line in file.xml
Will this do that ? I cant see how it will.
Thanks

vino · #4 (**permalink**) 04-26-2006

Quote:

Originally Posted by vino

Code:

sed -e "s/\(<oacore_nprocs [^>]*>\)[^<]*\(<.*\)/\1SOME-TEXT-TO-GO-IN\2/g"

The sed expression could get simpler. But this one would take anything between the tags and replace it with SOME-TEXT-TO-GO-IN.

Replace SOME-TEXT-TO-GO-IN with 1

Raom · #5 (**permalink**) 04-26-2006

as simple as this
sed -e 's/ptrn/newptrn/g' file

d__browne · #6 (**permalink**) 04-26-2006

tried both suggestions, neither worked.

sed -e "your_command" file.xml

just cats the file and does nothing

vino · #7 (**permalink**) 04-26-2006

Quote:

Originally Posted by d__browne

tried both suggestions, neither worked.

sed -e "your_command" file.xml

just cats the file and does nothing

Ofcourse, it will not write to the xml file. You need to redirect it and then move it to the original.

Something like

Code:

sed -e "your_command" file.xml > file.xml.new
mv file.xml.new file.xml

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