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Old 11-11-2004, 12:19 PM   #1
LQ Newbie
Registered: Apr 2004
Posts: 28

Rep: Reputation: 15
sed back referencing

Hi -

Is there a way to back reference things in sed similar to the perl ( ) reference? I'm changing the tiff2pdf bash script. The default output filename is foo.pdf. I'd like it to take the file name of whatever is being fed to the script, remove the tif portion and add .pdf.

For example:

$ tiff2pdf fax0000000001.tif

should output fax0000000001.pdf

Here's what I was thinking it was...but this isn't working

#out=foo.pdf # default output filename
out=`sed 's/(fax[0-9][0-9]*)\.tif/\1\.pdf/'`

Thanks for your help.
Old 11-11-2004, 12:47 PM   #2
Registered: Mar 2003
Location: Scotland
Distribution: Slackware, RedHat, Debian
Posts: 12,047

Rep: Reputation: 68
Why not just use:
echo fax0000000001.tif | sed 's/tif$/pdf/'
Old 11-11-2004, 04:20 PM   #3
LQ Newbie
Registered: Apr 2004
Posts: 28

Original Poster
Rep: Reputation: 15
Good quesiton. I suppose I will just use that. It did exactly as I needed; I just changed

echo fax0000000001.tif
echo $1

and I'm set. Thanks for the help. pjt


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