variables in sed

[Kris_5]

Hi Folks,

How do I put variables in a sed command?
for e.g.

bline_no=1
eline_no=35

sed '"$bline_no", "$eline_no"d' temp.txt >temp1.txt

Actually the requirement is I need to remove some of the lines from a text file and copy it to another file. Thanks in adv.

Kris

[A. Clay Stephenson · Accepted solution]

Hi:

This should get you started. The missing piece is 'eval'. The remainder is left as an exercise for the student.

#!/usr/bin/sh

bline_no=1
eline_no=35

eval sed -e '${bline_no},${eline_no}d' temp.txt > temp1.txt


Plan B) Build your sed commands as a script and use the -f arg.

Regards, Clay

[James R. Ferguson]

Hi:

Try this:

sed "$bline_no","$eline_no"d temp.txt > temp1.txt

Regards!

...JRF...

[Craig Rants]

Have you tried using a command file with the
-f option? The file would look like this

s/.cf//g
/default/d
/newname/d

The command string like this:

sed -f "commandfile" file.txt > file1.txt

I would recommend getting the O'Reily book on sed and awk. A lot of great stuff in there.

Enjoy
C