CODEWITHSUNDEEP
phpgrepexeccommand-line-interface
ToniWidmo
ToniWidmo

Reputation: 509

Can one PHP cli script detect if another PHP cli script is running?

Is there a reliable way in which a php cli script can detect if another php cli script is running? By running in this case, I mean it would return a row for itself if I did ps aux | grep scriptname.php in the command line.

This command also tends to return itself in the output however, so I'm worried that if I simply do an exec('ps aux | grep scriptname.php',$output); that it will return a false positive.

The script I am detecting also makes log entries, but under some conditions it sleeps for up to 5 minutes, so detecting its log entries seems a crude method of detection in this instance.

Upvotes: 0

Views: 654

Answers (2)

Barmar
Barmar

Reputation: 780673

Here's a slightly simpler version of leftclickben's answer. Wrapping one letter in the scriptname with [] saves you from having to filter out grep.

exec('ps aux | grep "[s]criptname.php"', $output);

Upvotes: 2

leftclickben
leftclickben

Reputation: 4614

You could use grep -v grep to filter out the "return itself in the output" part. That is, it will only find scriptname.php where there is not also grep in the command:

exec('ps aux | grep scriptname.php | grep -v grep', $output);

Upvotes: 1

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