How do i open a file?? PERL help?

Question

how do i open a file into a program that i have written to print out the exemptions of that file that i have typed in the command line eg.

home$ testprg.pl colour.txt

how do i get my program "testprg.pl" to open that colour.txt file formt he command line.... help

Answer 1

If the Perl program is expecting to read standard input, what you wanted is:

home$ testprg.pl < colour.txt

The < is a "redirect" operator.

If you want the program to open it itself, you'll need to code that in your Perl program:

my $fn ,$FILE;
$fn= $ARGV[1];
$file = open($fn) || die "can't open input file";
while() {
# do something
}

You get the idea.