The following script will add text to the beginning of files.
Donwload here. perlheader.pdf
This is done in three steps
1) This script copies the contents of a file to local variable by slurping.
2) The necessary text that needs to be added at the beginning of the file is added.
3) Then the original contents of the file are added using the local variable.
#!/usr/bin/perl
# Filename: header.pl
# Author : A.G.Raja
# Website : agraja.wordpress.com
# License : GPL
# pass files as arguments to this script
# this script will add the header text
use strict;
use warnings;
sub addheader{
my($infile,$header)=@_;
my $text = do { local( @ARGV, $/ ) = $infile ; <> } ;
open(FILE,”>$infile”);
print FILE $header;
print FILE $text;
close FILE
}
my $argnum;
foreach $argnum (0 .. $#ARGV){
my $infile = $ARGV[$argnum];
# Edit line below to change header text
my $header = “Header line 1nHeader line 2nHeader line 3n”;
&addheader($infile,$header);
}
# chmod +x header.pl
# ./header.pl *.txt
Donwload here. perlheader.pdf
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BS low – ratilnaoity high! Really good answer!
The script is quite useful, although it has got a minor bug into it.
The line below
my $text = do { local( @ARGV, $/ ) = $infile ; } ;
should be changed to
my @text = do { local( @ARGV, $/ ) = $infile ; } ;
Please use @text instead of $text
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Покажет ли тест на беременность беременность 3 недели.
Кстати, неплохо описал этот момент, а то я раньше смотрел только в новостях описания, а там они такие расплывчитые.
Hi AG Raja,
Im trying to use this script in one of my scripts, when I run it in its own script it works without problems, but when i use it in my big script on the line :
my $text = do { local( @ARGV, $/ ) = $infile ; } ;
my script hangs, I have worked out that this is because im using an ARGV as an input to my actual script large script. I dont really understand how this lines work, but is there a way to change it to not use @ARGV?
it would be great if you could help, but i realise this posting is very old.
many thanks,
Rizz
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