User environment variables when running sudo

by vs 5 years ago

GNU/Linux ◆ xterm-256color ◆ bash 2705 views

This example shows how you need to add an -E to pass the user environment when using sudo. If you don’t, the variables will be undefined. E.g., given this script

  #!/bin/bash

  echo "SINGULARITY_USERNAME is set to ${SINGULARITY_USERNAME}"
  echo "SINGULARITY_PASSWORD is set to ${SINGULARITY_PASSWORD}"

If you run it as /test_environment.sh and the variables are defined, you will see them!

  SINGULARITY_USERNAME is set to vanessasaur
  SINGULARITY_PASSWORD is set to omgwtftacos

If you use sudo, sudo ./test_environment.sh you will not!

  SINGULARITY_USERNAME is set to 
  SINGULARITY_PASSWORD is set to

The fix is to run (with sudo) adding the -E parameter sudo -E ./test_environment.sh

and then you will have the variables defined!

  SINGULARITY_USERNAME is set to vanessasaur
  SINGULARITY_PASSWORD is set to omgwtftacos

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

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asciinema play 188045.cast

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

<!DOCTYPE html>
<html>
<head>
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</head>
<body>
  <div id="player"></div>
  <script src="asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/188045.cast',
      document.getElementById('player'),
      { cols: 80, rows: 24 }
    );
  </script>
</body>
</html>

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

While this site doesn't offer 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 run the following command to create GIF file:

agg https://asciinema.org/a/188045 188045.gif

Or, if you already downloaded the recording file:

agg 188045.cast 188045.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.