如果您阅读了bash的手册页,您将在OPTIONS部分的顶部找到以下内容：
All of the single-character shell options documented in the description of the set builtin command can be used as options when the shell is invoked. In addition,bash interprets the following options when it is invoked...
如果您稍后在手册页中阅读了set命令的文档,您会发现：
-e Exit immediately if a pipeline (which may consist of a single simple command),a subshell command enclosed in parentheses,or one of the commands executed as part of a command list enclosed by braces (see SHELL GRAMMAR above) exits with a non-zero status. -x After expanding each simple command,for command,case command,select command,or arithmetic for command,display the expanded value of PS4,followed by the command and its expanded arguments or associated word list.
换句话说,-e使shell立即退出某些东西会返回一个错误(这通常在shell脚本中用作故障保护机制),-x允许详细执行脚本你可以看到发生了什么.
