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Single Command

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Single command is a way to ensure two instances of the same command won't run at the same time.

Installation

Unix users (Linux, BSDs and MacOSX)

Unix users may download and install latest single release with command:

sh -c "$(curl https://sweetohm.net/dist/single/install)"

If curl is not installed on you system, you might run:

sh -c "$(wget -O - https://sweetohm.net/dist/single/install)"

Note: Some directories are protected, even as root, on MacOSX (since El Capitan release), thus you can't install single in /usr/bin for instance.

Binary package

Otherwise, you can download latest binary archive at https://github.com/c4s4/single/releases. Unzip the archive, put the binary of your platform somewhere in your PATH and rename it single.

Usage

To ensure that command build args only runs once at a time, you would type:

single 12345 build args

Where:

  • 12345 is a port number that should be the same for given command. Must be greater than 1024 if not running as root.
  • build args is the command to run with arguments.

This command will:

  • Open a server socket on given port 12345. So that if another single command is already listening this port, this will fail.
  • Run given command.
  • Release the port when done.

Enjoy!