目录[[ ]] 不需要注意某些细枝末节[[ ]] 支持逻辑运算符[[ ]] 支持正则表达式总结[[ ]]是 Shell 内置关键字，它和 test 命令类似，也用来检测某个条件是否成立。
When running commands from a bash script, does bash always wait for the previous command to complete, or does it just s开发者_StackOverflow社区tart the command then go on to the next one?
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