use IPC::System::Simple qw(run);

my $exit_value1 = run("foo", @args);

my $exit_value2 = run([0..5], "foo", @args);

##</code><code>##

use IPC::System::ExitValue qw/exit_value exit_signal/;

system( "foo", @args );
croak "foo stopped early" if exit_signal($?);
my $exit_value = exit_value($?);

##</code><code>##

use IPC::System::ExitValue qw/assert_exit/;

system( "foo", @args ) and assert_exit( 0 .. 5 );