Command-line parameters are sent to a Perl program
in the same way they're sent to any other.
% ./myprog foo bar blat
The @ARGV array holds the command-line arguments,
and in this case, it would hold ('foo', 'bar',
'blat').
Perl allows for simplistic command-line options
via the -s option to perl:
#!/usr/bin/perl -s
print "value of -x: $x\n";
print "value of -name: $name\n";
Here's a sample run:
% ./myprog -x -name=Jeff
value of -x: 1
value of -name: Jeff
If you want more complex option parsing, there are
two standard modules that can do this for you:
Getopt::Std and Getopt::Long.
Perl allows you to treat the arguments in @ARGV as
filenames, by using the special case of the <>
operator.
while (<>) {
# $ARGV is the filename
# $_ is the line
# $. is the line number
# reset it to 0 by doing
# $. = 0 if eof;
# or
# close ARGV if eof;
}