Hello, I need advice on how to check if started processes are finished in perl, here's explanation :
OS is RHEL 4, perl -v = "This is perl, v5.8.0 built for i386-linux-thread-multi"

The logic of the script :

#!/usr/bin/perl

use warnings;
$param1 = $ARGV[0];
$param2 = $ARGV[1];
$param3 = $ARGV[2];

sub Help
{ help message goes here }
# some other subroutines follow

# main 
if (@ARGV < 3) {
        &Help; exit 1;
}
&cleanUp(); # pre-defined sub is being invoked here, stuff like $| = 1;
if ( $vars eq 'something' ) {
        &call_some_sub;
        } else {
        &call_another_sub;
}

&start_transfers;
# somehow understand that they are done
&static_stuff_sub;

Try waitpid().

waitpid - perldoc.perl.org

Thanks cbkihong, I saw that already, this would probably require fork(); but it won't work for me, at least in the way I wanted, I have arbitrary number of processes started via system command, and I can't use their PIDs, plus the execution of the subroutine call itself is successful, so I cannot do even :

wait &sub-call;
    if ($? == 0) {
        # do something else;
}