命令 test 或 [ 可以測試一個條件是否成立，如果測試結果為真，則該命令的Exit Status為0，如果測試結果為假，則命令的Exit Status為1（注意與C語言的邏輯表示正好 ... ... <看更多>

[ is usually an other name for the command test , just expecting a ] as last argument. You could actually write the two commands: ... <看更多>

Test for an interactive shell in Bash. GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

case $word in dog|cat|horse) echo yes;; *) echo no;; esac. ... <看更多>

... <看更多>