.shellcheckrc: enable optional checks (!38) · Merge requests · Arch Linux / Mkinitcpio / mkinitcpio-archiso · GitLab

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Suggest explicitly using -n in [ $var ]. https://www.shellcheck.net/wiki/SC2243 & https://www.shellcheck.net/wiki/SC2244
Suggest 'command -v' instead of 'which'. https://www.shellcheck.net/wiki/SC2230
Suggest quoting variables without metacharacters. https://www.shellcheck.net/wiki/SC2248
Require [[ and warn about [ in Bash/Ksh. https://www.shellcheck.net/wiki/SC2292