#!/usr/bin/perl 
# daemonize the program 

print "Parent pid: $$\n";    # I added this
&daemonize; 

$| = 1; 
while(1) { 
    print "\nIn the While\n"; 
    open(MYFILE,'>>temp.txt'); 
    print MYFILE "Hello Sri\n"; 
    close(MYFILE); 
} 

sub daemonize { 
    chdir '/' or die "Can't chdir to /: $!"; 
    open STDIN, '/dev/null' or die "Can't read /dev/null: $!"; 
    open STDOUT, '>>/dev/null' or die "Can't write to /dev/null: $!"; 
    open STDERR, '>>/dev/null' or die "Can't write to /dev/null: $!"; 
    defined(my $pid = fork) or die "Can't fork: $!"; 
    exit if $pid; 
    
    setsid or die "Can't start a new session: $!"; 
    umask 0; 
}