Problem using sed

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Hi,

I am trying to replace the old_string with the new_string using sed.
But i am unable to do it using the following script.

Shell Scripting Syntax (Toggle Plain Text)
#!/bin/sh
 
old_string="p cnf 10 20"
new_string="p cnf 98 99"
 
sed -e 's/old_string/new_string/' file1.txt > file2.txt
#!/bin/sh

old_string="p cnf 10 20"
new_string="p cnf 98 99"

sed -e 's/old_string/new_string/' file1.txt > file2.txt

Contents of file1.txt

Shell Scripting Syntax (Toggle Plain Text)
p cnf 10 20
2 3
5 6
9 10
12 30
p cnf 10 20
2 3
5 6
9 10
12 30

Any help is appreciated.

Last edited by guest7; Oct 17th, 2009 at 9:34 pm.

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guest7

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Junior Poster

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Oct 17th, 2009

Re: Problem using sed

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sed -e "s/$old_string/$new_string/" file1.txt > file2.txt

Aia

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Nearly a Posting Maven

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Nov 24th, 2009

Re: Problem using sed

I have a little sed problem which I can't seem to figure out:
I would like to concatenate the next line of a file to the current line if the current line doesn't end in ;
I tried the next command but it doesn't seem to work:

sed '/[^;]$/{N;s/\n//;}'

Any ideas?

chrislee.980

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