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Thanks for the reply,
but my problem is that I don't know the value in advance.
I need to read them and according to their values to change them.

Thanks.

I didn't mention this but it need to be in a perl script.

Thanks,
Zed

Hi,
How can I edit a line in a file?

For example, a.txt contains:
start: 1 2 3 4
stop: a b c d

and I want to change "3" to "9"

and to add "5" after "4"

the result should be (a.txt):...