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.pid file extension

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MySQL pid file.

The .pid file is a text file which contains a single line. This records the pid (numeric process identifier) for the MySQL process.

Each time MySQL is started it will write to this file and overwrite any previous contents. The file will be empty if MySQL could not start (in which case the error which prevented it from starting will be recorded in a corresponding .err file).

The .pid file is normally named after the computer (but this can be changed), so its full name will normally be:


where computer-name is the name of the computer/server on which MySQL is being run.

Can you add to this? Do you know of any applications not already listed which will work with .pid files, view .pid files or open .pid files? Are you able to contribute any additional reference information or file format information about .pid files or have you spotted any errors or omissions? If so please let us know by emailing us at feedback@cryer.co.uk - Thank you.