One Linux command per day (2) CD command

The CD command is used to switch the working directory to dirname. Where dirname notation can be either an absolute path or a relative path. If the directory name is omitted, it is transformed to the user's home directory (that is, the directory where login was first). In addition, the ~ is also expressed as the meaning of home directory, which is the current directory. Represents the previous level of directory at the current directory location.

1. Usage:

CD (options) [contents]

2. Function:

Toggle current directory to DirnamE
3. Options:

(1)-p If the destination directory to switch to is a symbolic connection, switch directly to the destination directory to which the symbolic connection is directed

(2)-L if the destination directory that you want to switch is a symbolic connection, switch directly to the directory that the character connection name represents, not the destination directory to which the symbolic connection is pointing.

(3)-When only the "-" option is applied, the current working directory will be switched to the directory represented by the environment variable "OLDPWD".
4. Example:

(1) CD into the user's home directory, CD ~ Enter the user's home directory;

[[Email protected] ~]$ CD//        * Just open terminal terminal, is the user's home directory */   * "CD/" intothe root directory *//]$ CD          ~]$/             * The default home directory is this "~" */

[[Email protected] ~]$ CD//        * "CD" Command and "CD ~" can achieve the same function*//]$ CD ~

(2) CD-Returns the directory in which it was located before entering this directory;

[Email protected]/]$ cd/home/Sunjimeng/* from the root directory into the user directory */[[email protected]~]$ ll//list directories and files under User directory total0drwxr-xr-x.2Sunjimeng Sunjimeng6May1  on: atDESKTOPDRWXR-xr-x.2Sunjimeng Sunjimeng6May1  on: atDOCUMENTSDRWXR-xr-x.2Sunjimeng Sunjimeng6May1  on: atDOWNLOADSDRWXR-xr-x.2Sunjimeng Sunjimeng6May1  on: atMUSICDRWXR-xr-x.2Sunjimeng Sunjimeng6May1  on: atPICTURESDRWXR-xr-x.2Sunjimeng Sunjimeng6May1  on: atPUBLICDRWXR-xr-x.2Sunjimeng Sunjimeng6May1  on: atTEMPLATESDRWXR-xr-x.2Sunjimeng Sunjimeng6May1  on: atVideos[[email protected]~]$ CD Desktop//Choose to go to the Desktop folder [[email protected] desktop]$ CD-//"CD-" Command function: (1) The name of the directory before the output and (2) return to the previous directory. /home/sunjimeng

(3) CD. Return to the parent directory (if the current directory is "/", then "/"; "..." after execution) For the meaning of the parent directory); CD. /.. Return to the top level two directory;

[Email protected]/]$ CD                        . /]$ cd/home/sunjimeng/Desktop  //Enter your custom folder [[email protected] desktop]$ CD                  . ~]$ CD. /..                     /]$

(4) CD!$ Use the parameters of the previous command as CD parameters.

[[email protected] ~]$ cd/home/sunjimeng/Desktop  !  $                 /home/sunjimeng/

~]$ CD! $CD: [Email protected] home]$

One Linux command per day (2) CD command