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Re: How to modify words in a line using perl oneliner

by ccn (Vicar)
on Sep 30, 2009 at 10:20 UTC ( #798279=note: print w/replies, xml ) Need Help??

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  1. or download this
    perl -i.bak -pe 's/first/last/g' one.txt 
    
  2. or download this
    perl -ni.bak -e 's/first/last/g; print' one.txt 
    

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[davido]: Using the -i switch causes Perl to rename the input file, read from it, and write to a file using the original file's name. If there's an extension provided, as in -i.bak, it's easy to see where the input file is. Where is the input file temporarily....
[davido]: placed if there is no extension provided to the -i switch?
[davido]: Nevermind, found the answer.
[davido]: If no extension is supplied, and your system supports it, the original file is kept open without a name while the output is redirected to a new file with the original filename. When perl exits, cleanly or not, the original file is unlinked.
[haukex]: doc says "If no extension is supplied, and your system supports it, the original file is kept open without a name ..."
[Corion]: :)

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