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SC2006: Use $(...) notation instead of legacy backticked `...`. SC2039: In POSIX sh, echo flags are undefined. SC2039: In POSIX sh, string replacement is undefined. SC2048: Use "$@" (with quotes) to prevent whitespace problems. SC2086: Double quote to prevent globbing and word splitting. SC2129: Consider using { cmd1; cmd2; } >> file instead of individual redirects. SC2166: Prefer [ p ] && [ q ] as [ p -a q ] is not well defined. SC2181: Check exit code directly with e.g. 'if mycmd;', not indirectly with $?. SC2206: Quote to prevent word splitting, or split robustly with mapfile or read -a. SC2230: which is non-standard. Use builtin 'command -v' instead. SC2231: Quote expansions in this for loop glob to prevent wordsplitting, e.g. "$dir"/*.txt . SC2234: Remove superfluous (..) around test command. SC2241: The exit status can only be one integer 0-255. Use stdout for other data.
