shell--内建命令--exec

最新推荐文章于 2024-11-25 20:15:00 发布

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最新推荐文章于 2024-11-25 20:15:00 发布

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分类专栏： IT_linux_shell

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本文详细介绍了exec命令的功能和用法，包括如何使用-exec选项替换当前shell、如何传递参数、使用-loption添加dash到零号参数、-coption执行带有空环境变量的命令、-aoption指定零号参数以及当命令无法执行时的行为。

1man exec

      exec [-cl] [-a name] [command [arguments]]
              If command is specified, it replaces the shell.  No new process is created.  The arguments become the  arguments  to  command.   If  the  -l option  is supplied, the shell places a dash at the beginning of the zeroth argument passed to command.  This is what login(1) does.  The -c option causes command to be executed with an empty environment.  If -a is supplied, the shell passes name as the zeroth argument to the executed  command.   If command cannot be executed for some reason, a non-interactive shell exits, unless the shell option execfail is enabled, in which case it returns failure.  An interactive shell returns failure if the file cannot be executed.  If command is  not  specified,  any redirections take effect in the current shell, and the return status is 0.  If there is a redirection error, the return status is 1.