文件系统中跳转【TLCL】

• pwd - Print name of current working directory
• cd - Change directory
• ls - List directory contents

Linux总是只有一个单一的文件系统树，其他设备挂在到树的各个节点上。

• cd Changes the working directory to your home directory.
• cd -Changes the working directory to the previous working directory.
• cd ~user_nameChanges the working directory to the home directory of user_name.

For example, cd ~bob will change the directory to the home directory of user “bob.”