Entry

How do I read command-line arguments with Perl?

Oct 14th, 2001 08:08
Robby Wallas, http://www.devdaily.com/perl/edu/qanda/

With Perl, command-line arguments are stored in the array named @ARGV.

$ARGV[0] contains the first argument, $ARGV[1] contains the second 
argument, etc.

$#ARGV is the subscript of the last element of the @ARGV array, so the 
number of arguments on the command line is $#ARGV + 1.

Here's a simple program that prints the number of command-line 
arguments it's given, and the values of the arguments:


#!/usr/bin/perl
#---------------------#
#  PROGRAM:  argv.pl  #
#---------------------#

$numArgs = $#ARGV + 1;
print "thanks, you gave me $numArgs command-line arguments.\n";

foreach $argnum (0 .. $#ARGV) {

   print "$ARGV[$argnum]\n";

}


If you run this program from a Unix command-line like this

./argv.pl 1 2 3 4


or, from a DOS command-line like this 

perl argv.pl 1 2 3 4


you'll get this result: 
thanks, you gave me 4 command-line arguments.
1
2
3
4