https://github.com/jswrenn/turnout-for-what

Shell utility for conditional redirection.
https://github.com/jswrenn/turnout-for-what

Last synced: about 1 month ago
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Shell utility for conditional redirection.

• Host: GitHub
• URL: https://github.com/jswrenn/turnout-for-what
• Owner: jswrenn
• Created: 2016-10-05T02:06:06.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2016-10-08T17:42:54.000Z (about 8 years ago)
• Last Synced: 2024-10-14T16:47:20.165Z (3 months ago)
• Language: Rust
• Size: 3.91 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.rst

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README

        
================

turnout-for-what

================

.. image:: https://upload.wikimedia.org/wikipedia/commons/a/a2/V%C3%BDm%C4%9Bna_hrotit%C3%A1.jpg

Usage

-----

::

    tfw SWITCH

``SWITCH``

    A file descriptor yielding a stream of line-separated paths. For every line received from stdin, the last path received from SWITCH indicates the file that the line should be redirected to.

Example

-------

A load-balancer for the natural numbers::

    #!/usr/bin/env bash

    trap "rm -f nat {0..4}; pkill -P $$" EXIT

    touch nat {0..4}

    while true; do

      echo $((i++))

      sleep 0.2;

    done > nat &

    tail -f nat | cargo run -- <(tail -f nat | xargs -I{} expr {} % 5) &

    while true; do

      sleep 0.2

      clear

      wc -l {0..4}

    done

This script will create five text files, balance the natural numbers 

between them, and continuously print their line counts.