in reply to
help me on seek and tell function
Discover perlfaq. Specifically from perlfaq5 read How do I change one line in a file/delete a line in a file/insert a line in the middle of a file/append to the beginning of a file?
Inplace editing may be what you want.
perl -pi.bak -e 's/this string/that string/g' some.file
Postpone until later
Each and every
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