cd在suse上仅是shell builtin, sudo仅仅执行的executable(外部命令), 路径由 /etc/sudoers 的Defaults secure_path = /path1:/path2 指定
There are two ways that it “won’t work”, depending on your OS:
-
If your OS follows POSIX, then running
sudo cd
will cause the external command “cd” (usually located at/usr/bin/cd
) to execute in a forked process as the root user. That process changes directories successfully. Once that process is done, you will be returned to your regular shell, which is still in the directory where it started.So
sudo cd
runs without error, but does not change the current working directory of your current shell.(reference: this answer)
-
Otherwise, running
sudo cd
will cause the following to happen. Your computer will look through your PATH, trying to find an executable named “cd”. It will not find one. (only the shell built-in command “cd” exists, and that is not an executable file). Hence, you get an error. (On Ubuntu, I get the error messagesudo: cd: command not found
.)So
sudo cd
runs with error.
原文地址:http://www.cnblogs.com/dissipate/p/16852293.html