substitution in c-shell script

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vikas.m0502

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I have one file :
mem_x mem_x
mem_x mem_x
...
mem_x mem_x

I want to change this to :
mem_1 mem_1
mem_2 mem_2
...
mem_n mem_n

I am trying it with csh script but it keeps giving some error.
Please help.
Thanks in advance.
 

This perl one liner will do it
perl -pi -e 's/x/$./g' <file_name>
 

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