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09-27-2007
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How to change only the x first characters of a string?
Hi,
How can I replace x first characters from a string? I have a file with... say 10000 entries as follows: 00123456781 00123456782 00123456783 ... What I want to do is change the leading "00" with for example "12" The leading 00 can be in some files some other 1 or more digits e.g. "1" or "123" or what ever. What would be the most efficient way of doing this as there might be even 20.000.000 entries in one file. I wonder if the method could be embedded to a oneliner such as: perl -i -p -e "s/old/new/g" filename Thanks! |
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