Replace string with new string

Shell Programming and Scripting
1

I have c shell script , basically i want to find out the string "/usr/inter/wat/dat/out" and replace with "/home/trw/sh" in multiple input files

Please advise. We use Linux red hat server.

Cshell 1:
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#!/bin/csh
set file_name="/usr/inter/wat/out/bill_validate.txt"
2 
old="/usr/inter/wat/dat/out"
new="/home/trw/sh"

sed "s/$old/$new/g" file >new_file
3

Check the delimiters for substitution.

1 Like
4

thank you so much for your email.
Is it possible to replace a string without creating new file?
And also i have to do it for 35 files...
How to do it generic for all the 35 files in command prompt?

Thanks in advance.

old="/usr/inter/wat/dat/out" new="/home/trw/sh"  sed "s/$old/$new/g" file >new_file
5 
old="/usr/inter/wat/dat/out"
new="/home/trw/sh"

sed "s/$old/$new/g" file >new_file

I'm afraid that won't work. Try it, it will crash. You have to use a different separator character than / in this situation:

old="/usr/inter/wat/dat/out"
new="/home/trw/sh"

sed "s!$old!$new!g" file >new_file

In your C shell script you will loop through the files, and apply the sed command to each file in turn. Or, using GNU sed, you can say sed -i "s/A/B/g" *.txt and it will edit them all in place, making a temporary file in the background for each one.