Hi rjsaulakh,

As ysth pointed out, my code was not doing the in-place editing part, nor the multi-line edit.  But those are quite easy to do.

Here's a modified example that should work for you.

Notice that the datafile can contain blank lines or commented-out lines, which are skipped (eg. # testfile).

Notice, too, that the input file, once it's read and processed, is being written to, so it's REALLY an in-place edit.

Warning:  Since it's doing in-place edits, be careful to have a backup copy of any files that you need to keep the original of!

Here's the code:

#!/usr/bin/perl
                                                                      
+          
# Always use these
use strict;
use warnings;
                                                                      
+          
# Edit contains the complete path of the files to be edited
my $path = "/home/rjs/heena/edit" ;
                                                                      
+          
# Getting a file handler (and test for success/failure!)
open(FL, "<", $path) or die "unable to open data file '$path' ($!)\n";
                                                                      
+          
# Getting all the file names in the @array so that i can process the
# file one by one
chomp(my @array = <FL>);
                                                                      
+          
# Close the data file
close(FL);
                                                                      
+          
# Process each file
                                                                      
+          
foreach my $file (@array) {
    next if ($file =~ /^\s*(#|$)/);   # Skip blank/commented lines
    process_file($file);              # Process file
}
                                                                      
+          
                                                                      
+          
# Subroutines
sub process_file {
    my ($file) = @_;
                                                                      
+          
    $/ = "";    # Read entire file as a single line
    my $fh;     # Declare file handle (better than using globals)
                                                                      
+          
    # Read the file
    open($fh, "<", $file) or die "unable to read file '$file' ($!)\n";
    $_ = <$fh>;
    close($fh);
                                                                      
+          
    # Apply the change
    s/CONFIDENTIAL(.*?)own\s+risk/ /sm;
                                                                      
+          
    # Write the file back TO THE SAME FILENAME
    open($fh, ">", $file) or die "unable to write file '$file' ($!)\n"
+;
    print $fh $_;
    close $fh;
}
[download]

I made the file-processing into a subroutine for clarity, but you could do it within the loop if you wanted to, naturally.

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