ubuntu 下sudo cd 会报command not found

               

ubuntu 下sudo cd 会报command not found   
参考:http://linuxcommando.blogspot.com/2007/11/sudo-hacks-making-cd-and-redirection.html       
通过which cd命令发现        
cd:      aliased to set olddir=$cwd ; chdir !*        
也就是说,cd是shell内置的,不是普通的命令,所以不能通过sudo运行        
如果确实需要运行cd,可以先输入sudo -s,然后就可以运行cd了,不过发现变成root@hostname了,也就是说变成root登陆了.        

引用一段比较好的英文解释        

cd is a shell built-in command. It cannot be run in a child process. The child process simply cannot change the working directory of its parent shell process.        

Redirection also does not work with sudo for the same reason (redirection being a shell "thing")        

 

sudo 'ls /root/restricted >/root/out.txt'

sudo: ls /root/restricted >/root/out.txt: command not found

           

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