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Shell Programming and Scripting

Replace string with new string

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# 1  
Old 05-10-2013
Replace string with new string
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:
------------
Code:
#!/bin/csh
set file_name="/usr/inter/wat/out/bill_validate.txt"

Last edited by Scrutinizer; 05-10-2013 at 03:46 AM.. Reason: code tags
# 2  
Old 05-10-2013
Code:
old="/usr/inter/wat/dat/out"
new="/home/trw/sh"

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

# 3  
Old 05-10-2013
Quote:
Originally Posted by PikK45
Code:
old="/usr/inter/wat/dat/out"
new="/home/trw/sh"
 
sed "s/$old/$new/g" file >new_file

Check the delimiters for substitution.
This User Gave Thanks to elixir_sinari For This Post:
PikK45
# 4  
Old 05-10-2013
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.

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

Last edited by Scrutinizer; 05-10-2013 at 03:46 AM.. Reason: code tags
# 5  
Old 05-10-2013
Code:
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:
Code:
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.
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