Re: Modifying A Bunch of Files by replacing specific lines

This assumes that your sections start and end on seperate lines...if that's not the case an slightly different version is required. See perlman:perlrun for the details of the switches.

On a *nix system you don't need the first line of the BEGIN{} block

#! perl -snli.org
use strict;
use vars qw[$B $E $R $s];
BEGIN{
    @ARGV= map{glob}@ARGV; # Not necc. on *nix
    $s=0
}

    /<!- $B -->/ .. (/<!- $E -->/ && ($s = 1))
    ? ($s and print($R), $s = 0 )
    : print
[download]

sample usage

C:\test>del junk.in && ren junk.in.org junk.in

C:\test>type junk.in
-i[*extension*]
     If the extension doesn't contain a "*", then it is appended to th
+e
     end of the current filename as a suffix. If the extension does
     contain one or more "*" characters, then each "*" is replaced wit
+h
     the current filename. In Perl terms, you could think of this as:

         ($backup = $extension) =~ s/\*/$file_name/g;

     This allows you to add a prefix to the backup file, instead of (o
+r
     in addition to) a suffix:
<!- BRS -->
         $ perl -pi 'orig_*' -e 's/bar/baz/' fileA   # backup to 'orig
+_fileA'
<!- ERS -->
     Or even to place backup copies of the original files into another
     directory (provided the directory already exists):

         $ perl -pi 'old/*.orig' -e 's/bar/baz/' fileA # backup to 'ol
+d/fileA.orig'
<!- BRS -->

    These sets of one-liners are equivalent:
<!- ERS -->
         $ perl -pi -e 's/bar/baz/' fileA            # overwrite curre
+nt file
         $ perl -pi '*' -e 's/bar/baz/' fileA        # overwrite curre
+nt file

         $ perl -pi '.orig' -e 's/bar/baz/' fileA    # backup to 'file
+A.orig'
         $ perl -pi '*.orig' -e 's/bar/baz/' fileA   # backup to 'file
+A.orig'


C:\test>test -B=BRS -E=ERS -R="Replacement text" junk.in

C:\test>type junk.in
-i[*extension*]
     If the extension doesn't contain a "*", then it is appended to th
+e
     end of the current filename as a suffix. If the extension does
     contain one or more "*" characters, then each "*" is replaced wit
+h
     the current filename. In Perl terms, you could think of this as:

         ($backup = $extension) =~ s/\*/$file_name/g;

     This allows you to add a prefix to the backup file, instead of (o
+r
     in addition to) a suffix:
Replacement text
     Or even to place backup copies of the original files into another
     directory (provided the directory already exists):

         $ perl -pi 'old/*.orig' -e 's/bar/baz/' fileA # backup to 'ol
+d/fileA.orig'
Replacement text
         $ perl -pi -e 's/bar/baz/' fileA            # overwrite curre
+nt file
         $ perl -pi '*' -e 's/bar/baz/' fileA        # overwrite curre
+nt file

         $ perl -pi '.orig' -e 's/bar/baz/' fileA    # backup to 'file
+A.orig'
         $ perl -pi '*.orig' -e 's/bar/baz/' fileA   # backup to 'file
+A.orig'
[download]

Examine what is said, not who speaks.

The 7th Rule of perl club is -- pearl clubs are easily damaged. Use a diamond club instead.

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