Multiplexer CLI tool

Takes a filename as an argument. It will then treat each line from this file as a command and spawn a process with it. Finally it will multiplex the output of each of those processes, prefixing each line with the PID of that process.

Usage (CLI)

`` sh
npm install -g multiplexer
`

` sh
echo "\
while [ 1 ] ; do echo beep ; sleep 1 ; done
while [ 1 ] ; do echo boop ; sleep 1 ; done
while [ 1 ] ; do echo baap ; sleep 1 ; done" > example-commands

multiplexer example-commands
`

Output:

`
25242 beep
25244 boop
25246 baap
25242 beep
25244 boop
25246 baap
25242 beep
25244 boop
25246 baap
`

Usage (as a module)

` sh
npm install multiplexer
`

` js
const multiplexer = require('multiplexer')

multiplexer([
'while [ 1 ] ; do echo beep ; sleep 1 ; done',
'while [ 1 ] ; do echo beep ; sleep 1 ; done',
'while [ 1 ] ; do echo beep ; sleep 1 ; done'
])
`

Instead of a string, each command can be an object with the following fields:

* cwd ... Set working directory
* env ... Set of environment key-value pairs
* uid ... Run as User ID
* gid ... Run as Group ID
* detached ... Detach from parent process
* alias ... Custom log prefix (default: process id)
* waitFor` ... Wait for process to print given string to stdout before spawning next process