IPCS remove semaphores

If you get an error message saying
"HTTPD dead but PID exists", your disk space is either full or all IPCS semaphores have been used up.

ipcs -s | awk ' $3 == "apache" {print $2, $3}' | awk '{ print $1}' | while read i; do ipcrm sem $i; done

Clean up ipcs semaphores

Remove blank / empty lines PHP [29]

I found this great implementation to remove blank (empty lines) from a string at PHP web site.

function removeEmptyLines($string)
{
return preg_replace("/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/", "\n", $string);
}