#!/usr/bin/perl -w
use DBI;

# connect to the database
my $dbh = DBI->connect('dbi:mysql:ass2db', 'test', '123')
    or die "Can't connect: ", $DBI::errstr;

# prepare a SQL statement to insert your data

# (using placeholders ("?") so you only have to
# compile the statement once)

my $sth = $dbh->prepare(<<SQL) or die "Can't prepare: ", $dbh->errstr;
insert into ASS2 (User_name, Pass)
values (?, ?)
SQL

# open up your data file
open FILE, "data.txt" or die "Can't open: $!";

while (<FILE>)
{
    chomp;

# parse your data out of the file
my($d1, $d2) = split(':', $_); # assuming tab-separated data

#use system command to add user and set passwd
system "useradd -m -p $d1 $d2";

# insert your data into the database
$sth->execute($d1, $d2);
}

close FILE;

$sth->finish;
$dbh->disconnect;