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.shellcheckrc: enable optional checks

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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
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nl6720 2022-12-03 11:33:21 +02:00
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commit 40dbfcfaf0
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# Suggest explicitly using -n in `[ $var ]`
enable=avoid-nullary-conditions
# Suggest 'command -v' instead of 'which'
enable=deprecate-which
# Suggest quoting variables without metacharacters
enable=quote-safe-variables
# Require [[ and warn about [ in Bash/Ksh
enable=require-double-brackets