'fish' needs 'bc' as a propagated input. I have noticed runtime errors due to absence of bc. It's also mentioned here:
https://github.com/fish-shell/fish-shell#runtime-dependencies Quoting the relevant paragraph: "fish requires a number of utilities to operate, which should be present on any Unix, GNU/Linux or OS X system. These include (but are not limited to) hostname, grep, awk, sed, which, and getopt. fish also requires the bc program."
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