wait call.
To get the actual exit value divide by 256. See also exec. This is NOT what you want to use to capture the output from a command, for that you
should use merely back-ticks or qx//, as described in `STRING`.
Because system and back-ticks block
SIGINT and
SIGQUIT, killing the program they're running doesn't actually interrupt your program.
@args = ("command", "arg1", "arg2");
system(@args) == 0
or die "system @args failed: $?"
Here's a more elaborate example of analysing the return value from system on a
UNIX system to check for all possibilities, including for signals and coredumps.
$rc = 0xffff & system @args;
printf "system(%s) returned %#04x: ", "@args", $rc;
if ($rc == 0) {
print "ran with normal exit\n";
}
elsif ($rc == 0xff00) {
print "command failed: $!\n";
}
elsif ($rc > 0x80) {
$rc >>= 8;
print "ran with non-zero exit status $rc\n";
}
else {
print "ran with ";
if ($rc & 0x80) {
$rc &= ~0x80;
print "coredump from ";
}
print "signal $rc\n"
}
$ok = ($rc != 0);