I noticed today when I tried to restart apache on my Mac that it had stopped working and gave me this error:
/usr/sbin/apachectl: line 82: ulimit: open files: cannot modify limit: Invalid argument
Luckily the world is a big place and someone had already fixed the problem.
Just open up /usr/sbin/apachectl and change (around line 64):
ULIMIT_MAX_FILES=”ulimit -S -n `ulimit -H -n`”