Hi guys, I just joined minutes ago and I'd first like to say hello. I'm a student with an assignment on hand to program a basic password manager. This line shows how I can show and decode the data

I am using a cygwin terminal, btw.

perl passmgr0957.pl L abc Facebook

Where L is the option command to List, abc is the decode key and Facebook is the search string to search for the password for the user's Facebook account. The search string is to be OPTIONAL, and I am terribly boggled by this because I haven't learnt how to work with optional arguments.

Can someone help me out, teach me how I can go about writing this?

This is my full code if needed. ST2614 is a module my lecturer provided to decode and encode using an XOR format (As what he told me)

A million thanks to any kind soul who can help!

#!/usr/bin/perl -w
use strict;
use warnings;
use ST2614 1.0;


#subroutine guide provides user a simple documentation on how to use t
+he password manager
sub guide {
    my $pwdmgr = shift;
    print "usage: $pwdmgr L key [site_pattern]\n";
    print "-"x5, " takes the encoding key and optional site_pattern to
+ retrieve 
    all saved entries that match.\n If no site_pattern, retrieve all s
+aved entries\n\n";
    print "usage: $pwdmgr U key site_name login_id password [URL]\n";
    print "-"x5, " Using the encoding key, add new or update existing 
+entry.\n Complete set of 
    entry info required: Site name, login id, password, URL(Optional)\
+n\n";
    print "usage: $pwdmgr D key site_name\n";
    print "-"x5, " Takes in encoding key and site_name to delete entry
+; will only work if 
    encoding key matches and entry found matching with site_name.\n";
    exit;
}

#an if-elsif loop to check which option user has selected
if ($ARGV[0] eq "L") { 
    sub listFunct ($;$) {
        open(FILEHANDLE, "passmgr.dat") or die ("The file cannot be op
+ened!");
            my $decode = ST2614::decode(FILEHANDLE, $ARGV[1]);
            
    
    }
    

} elsif ($ARGV[0] eq "U") { 

    #declare the individual variables that are to be stored
    my $sitename = $ARGV[2]; #sitename will be the key in the hash of 
+array
    my $loginid = $ARGV[3];
    my $password = $ARGV[4];
    my $url = $ARGV[5];
    
    #declare a hash of array to prepare storage of all variables to be
+ encoded together
    my HoA {$sitename} = ["$loginid", "$password", "$url"];;
    open(FILEHANDLE, ">>passmgr.dat") or die("The file cannot be opene
+d!");
        my $encode = ST2614::encode(HoA, $ARGV[1]);
        print FILEHANDLE "$encode";
        close FILEHANDLE;
    
    print "Data successfully encoded. Please remember your key.\n Your
+ key is $ARGV[1].";
    
} elsif ($ARGV[0] eq "D") { 

    

} else {
    guide($0);
    }
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