how can i modify a text file by perl -

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i want make 'find/change' function.

  1. open original file.

  2. change words through using s/ / / or tr/ / / it's not working, think.

    open(txt, ">>text.txt"); $str = <txt>; $str =~ s/'a'/'b'/; print txt $str;

look @ example:

 ... open rh, "text.txt" or die $!; chomp(my @lines = <rh>); close rh;  open wh, ">text.txt" or die $!; foreach $line (@lines) {   $line =~ s/'a'/'b'/;   print wh "$line\n"; } close wh;  ...

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