in reply to How to split a document at a column

you can use substr for that: 
perl -i.bak -ple 'substr($_, 25, 0, " ") if length > 24' filename.txt

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Re^2: How to split a document at a column
by ikegami (Patriarch) on Mar 29, 2007 at 13:25 UTC
    I find it odd that you add a space at the end of "1234567890123456789012345", but you don't add any spaces at the end of "123456789012345678901234".
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