How do I daemonize an arbitrary script in unix?

Question

I\'d like a daemonizer that can turn an arbitrary, generic script or command into a daemon.

There are two common cases I\'d like to deal with:

1. I hav

Answer 1

You could give a try to immortal It is a *nix cross-platform (OS agnostic) supervisor.

For a quick try on macOS:

brew install immortal

In case you are using FreeBSD from the ports or by using pkg:

pkg install immortal

For Linux by downloading the precompiled binaries or from source: https://immortal.run/source/

You can either use it like this:

immortal -l /var/log/date.log date

Or by a configuration YAML file which gives you more options, for example:

cmd: date
log:
    file: /var/log/date.log
    age: 86400 # seconds
    num: 7     # int
    size: 1    # MegaBytes
    timestamp: true # will add timesamp to log

If you would like to keep also the standard error output in a separate file you could use something like:

cmd: date
log:
    file: /var/log/date.log
    age: 86400 # seconds
    num: 7     # int
    size: 1    # MegaBytes
stderr:
    file: /var/log/date-error.log
    age: 86400 # seconds
    num: 7     # int
    size: 1    # MegaBytes
    timestamp: true # will add timesamp to log