stderred - stderr in red

by ku1ik 12 years ago

GNU/Linux ◆ rxvt-unicode-256color ◆ bash 9945 views

stderred hooks on write() and a family of stream functions (fwrite, fprintf, error…) from libc in order to colorize all stderr output that goes to terminal thus making it distinguishable from stdout. Basically it wraps text that goes to file with descriptor “2” with proper ANSI escape codes making text red.

It’s implemented as a shared library and doesn’t require recompilation of existing binaries thanks to preload/insert feature of dynamic linkers.

It’s supported on Linux (with LD_PRELOAD), FreeBSD (also LD_PRELOAD) and OSX (with DYLD_INSERT_LIBRARIES).

More info

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You can download this recording in asciicast v2 format, as a .cast file.

Download

Replay in terminal

You can replay the downloaded recording in your terminal using the asciinema play command:

asciinema play 1705.cast

If you don't have asciinema CLI installed then see installation instructions.

Use with stand-alone player on your website

Download asciinema player from the releases page (you only need .js and .css file), then use it like this:

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" type="text/css" href="asciinema-player.css" />
</head>
<body>
  <div id="player"></div>
  <script src="asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/1705.cast',
      document.getElementById('player'),
      { cols: 88, rows: 30 }
    );
  </script>
</body>
</html>

See asciinema player quick-start guide for full usage instructions.

While this site doesn't provide GIF conversion at the moment, you can still do it yourself with the help of asciinema GIF generator utility - agg.

Once you have it installed, generate a GIF with the following command:

agg https://asciinema.org/a/1705 demo.gif

Or, if you already downloaded the recording file:

agg demo.cast demo.gif

Check agg --help for all available options. You can change font family and size, select color theme, adjust speed and more.

See agg manual for full usage instructions.