I am writing the script for "option" while getting arguments from command line, and below I have code,
use strict;
use warnings;
use Getopt::Std;
my %options;
if (scalar @ARGV < 3) {usage()};
sub usage
{
print STDERR << "EOF";
\nThis program does...
usage: $0 [-hcfo]
-h : this (help) message
-c : config file
-o : Fj xcf release file
-x : output file
EOF
exit;
}
getopts ("hc:f:o:", \%options);
usage() if $options{h};
my $source_file= $options{o};
my $dest_file= $options{x};
my $config_file= $options{c};
And in above code, I want to "-o" to be optional for example if user don't provide "-o(filename)" that means value for $source_file then I want to take default file suppose "source.txt";
Could any one guide me how can that be done?Please.
Cheers