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Monitorix is a free, open source, lightweight system monitoring tool designed
to monitor as many services and system resources as possible. It has been
created to be used under production Linux/UNIX servers, but due to its
simplicity and small size may also be used on embedded devices as well.
cmdok checks that specified commands are OK. If command is OK than it exists in PATH and can be run.
It is a simple, small and portable Bash script. It is useful in software packages that want to check that some commands exist before trying to run them.
See wiki for more information and examples.