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I want to customize a little my GRUB 2 bootloader, so I'm asking how can I set a variable equal to the output from a command in GRUB2?

I am interested to pass the output of date command to a variable. Moreover, how can I retain only the time or hour in that variable?

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2 Answers 2

Reset to default
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I found the answer myself. Instead to use date command, I can use insmod datehook module and like this the following environment variables will be accessible: $YEAR, $MONTH, $DAY, $HOUR, $MINUTE, $SECOND, $WEEKDAY.

Example: https://askubuntu.com/a/323516/147044

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You need Command Substitution:

now=$(date)
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    This working in bash, but not when I am using the grub interpreter.
    – Radu Rădeanu
    Commented Jul 23, 2013 at 18:08
  • grub's shell is much more minimal than bash. See this bug about capturing command output.
    – Josh McGee
    Commented Jul 23, 2013 at 19:07
  • I know what it is... Hence my question
    – Radu Rădeanu
    Commented Jul 23, 2013 at 19:14
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    if you'll read the link i gave you, there are no plans to include this capability in grub's shell. hence my link to it.
    – Josh McGee
    Commented Jul 23, 2013 at 19:21
  • Ok, you should bring that idea as an answer and if no others answers will appear, I will accept it... but not this answer that is referring at bash.
    – Radu Rădeanu
    Commented Jul 23, 2013 at 19:27

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