From the category archives:

Linux

HEYU: Can’t open tty line. Check the permissions.

by Ron on June 20, 2008

I occasionally get this error when trying to run a heyu command from CLI. This should fix your problem:
(As root)
chmod 777 /dev/ttyS0

by Ron on June 13, 2008

Need to calculate a date in the future or past?
$eight_days_ago = date(’Ymd’, mktime(0,0,0,date(”m”),date(”d”)-8,date(”Y”)));