该命令的作用是什么? "exec bash -l" [英] What does this command do? "exec bash -l"

问题描述

此命令做什么?

exec bash -l

我发现此命令是提醒文本文件的一部分，当时我写了一些有关如何创建ssh密钥和克隆git repo的说明，但是我很久以前就写了它，我不记得它的作用.

I found this command as part of a reminder text file were I wrote some instructions regarding how to create a ssh key and clone a git repo, but I wrote it a long time ago and I can't remember what it does.

推荐答案

exec执行指定的命令，替换当前进程，而不是启动新的子进程.

exec executes a specified command, replacing the current process rather than starting a new subprocess.

如果您输入

bash -l

在shell提示符下，它将调用一个新的shell进程(-l使其成为登录shell).如果退出该Shell进程，则将返回到原始的Shell进程.

at a shell prompt, it will invoke a new shell process (the -l makes it a login shell). If you exit that shell process, you'll be back to your original shell process.

输入

exec bash -l

表示新的shell进程替换您当前的shell进程.这可能会减少一些资源消耗.

means that the new shell process replaces your current shell process. It's probably slightly less resource intensive.

这样做的原因可能是因为新的shell设置了其环境(通过阅读.bashrc，.bash_profile等).

The reason for doing it is probably so that the new shell sets up its environment (by reading your .bashrc, .bash_profile, etc.).

有关更多信息，请参见bash文档:

See the bash documentation for more information:

• Bash启动文件，用于说明登录Shell与密码的区别非登录外壳
• Bourne Shell Builtins ，以获取有关exec命令的文档

• Bash Startup Files for how a login shell differs from a non-login shell
• Bourne Shell Builtins for documentation on the exec command.

(您应该可以通过输入info bash在自己的系统上阅读该手册.)

(You should be able to read the manual on your own system by typing info bash.)

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