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Re: substitute a word in the whole file .. how ???

by dbwiz (Curate)
on Aug 13, 2003 at 11:28 UTC ( #283508=note: print w/replies, xml ) Need Help??

in reply to substitute a word in the whole file .. how ???

perl -i.bak -pe 's/frog/toad/g' txtfile

This one-liner will save your old file into txtfile.bak, and modify txtfile by changing every occurrence of "frog" into "toad".

See perlrun for details on the command line arguments.

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Re: Re: substitute a word in the whole file .. how ???
by star7 (Novice) on Aug 13, 2003 at 12:40 UTC
    I don`t want save the old file, and the commands must be in a perl-script.
    s/frog/toad/g txtfile
    enough ??? star7
      s/frog/toad/g txtfile
      won't work inside a perl script. It works from the command line because "txtfile" is actually be handed to the mini-script created by using 'perl -i.bak -pe 's/frog/toad/g'. Use 'perl --help' to see what -i -p and -e mean. This sounds a lot like a homework assignment, but here is one solution:
      #!/usr/bin/perl -w use strict; # this script will edit itself ReplaceStuff($0,'word','taco'); sub ReplaceStuff{ my ($file,$origword,$newword) = @_; local $^I=""; # set the backup tag to nothing local @ARGV = $file; # make a local @ARGV so we can use <> # go through each line and do the substitution while (<>) { s/$origword/$newword/g; print; # print stuff out } }
        It's worth noting that you can put those command line arguments in the hashbang at the head of the script, e.g.
        #!/usr/bin/perl -w -i.bak -p s/frog/toad/g;

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