On Jul 28, Keenan, Greg John (Greg)** CTR ** said:
sub getDate {
print "start date\n";
if ( system("/bin/date") ) {
print "can't get date\n";
exit(2);
}
print "finish date\n";
}
system() executes a command, and returns the shell's error code. 0
indicates success, non-0 indicates failure. It does NOT return the
output. If output is produced from the program, it's printed to STDOUT.
sub getDate {
print "start date\n";
if ( `/bin/date` ) {
print "can't get date\n";
exit(2);
}
print "finish date\n";
}
Backticks execute a command and return its output. Since the return value
is true in this case, the if() statement's condition is true, and you call
exit().
If system() or ``s fail, you should check $! to see the error message.
--
Jeff "japhy" Pinyan % How can we ever be the sold short or
RPI Acacia Brother #734 % the cheated, we who for every service
http://japhy.perlmonk.org/ % have long ago been overpaid?
http://www.perlmonks.org/ % -- Meister Eckhart
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