Read from a file : Getopt « System Functions « Perl

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Perl » System Functions » Getopt

Read from a file

      



    #!/usr/local/bin/perl -w



    use Getopt::Long;



    my $ret = GetOptions ("f|filename:s");

    my $filename = $opt_f || die "Usage: $0 -f filename\n";



    # Open the file.

    open (INPUT, "$filename") || die "Could not open file $filename : $!\n";



    while (<INPUT>)

    {

       chop;

       print "Line $. = <$_>\n";

    }

    close (INPUT);

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4.	Extract command-line switches with Getopt::Std
5.	Perform consistent command line parsing
6.	Process complex command lines
7.	To turn a feature on or off. Use the exclamation point(!)
8.	Using Getopt to deal with command line options
9.	getopt('pMN');
10.	If the value is optional, use a colon
11.	For a text string value, use :s for an optional value or =s for a required value:
12.	Check if a file exists
13.	A double dash (--) by itself signals the end of the command-line switches.

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