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Editorial Team
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Asked: 2026-06-17T16:42:50+00:00

This: while [[ $red -le 255 && $switch -eq 0 ]] || [[ $red

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This:

while [[ $red -le 255 && $switch -eq 0 ]] || [[ $red -ge 0 && $switch -eq 1 ]]; do

works perfectly fine under OS X, but I’m having trouble getting it to work in Ubuntu. I feel like it’s something extremely basic that I’m missing, but after Googling around I’m yet to find a solution.

The error is:

[[: not found

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1 Answer

  1. Editorial Team

    The default shell and /bin/sh substitute on Ubuntu is dash which does not understand [[. Make sure you are running the script in bash.

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