How in Centos, when composing a Cron task, to prevent the script from being called before the previous call completes?

Question

PHP

Now it is called like this (configured in VESTA)

php /home/admin/web/default.domain/public_html/xxx/hotels.php

It is necessary that a new call does not occur before the old one completes.

Answer 1

flock -n /tmp/blah.lock -c 'php /home/admin/web/default.domain/public_html/xxx/hotels.php'

This command needs to be run. If flock is not installed then yum install flock to start with.

Answer 2

if [ ! -f /tmp/lock ]; then touch /tmp/lock; php hotels.php; rm /tmp/lock; else exit 0; fi

either way
We check the lock-file, if it does not exist, then create it, execute the script, delete it. if the lock file exists, then we just exit.