8.23 Lesson-2

Directory class:

mkdir, RmDir, tree, DirName, basename

mkdir command

When the-P parent directory is not present, create it together

-V Display procedure

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/71/F1/wKiom1XbC1TBNo5nAADRZdDmeD0109.jpg "/>

rmdir command

Delete Empty Directory

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/71/F1/wKiom1XbC1SBy33EAABgojeo9vo190.jpg "/>

There are files in the directory that cannot be deleted and prompt

Tree command

-l Specifies the display level

-D Display directory-only files at level

DirName command

View base Name

[Email protected] ~]# Dirname/etc/sysconfig/network-scripts/ifcfg-eth0

/etc/sysconfig/network-scripts

basename command

View file name

[Email protected] ~]# Basename/etc/sysconfig/network-scripts/ifcfg-eth0

Ifcfg-eth0

Text view:

Cat, TAC, more, less, tail, head

Cat command

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/71/ED/wKioL1XbDWniFaepAAA9NdfKFtk100.jpg "/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/71/ED/wKioL1XbDWnDEcm2AACbQPqQViE515.jpg "/>

TAC display order opposite TAC

More and less, but more in the display after the exit, and less can go up and down, press Q to exit browse

Less command

ENTER Down Line

Space down one screen

b up one screen

Q exit

/keyword to find keywords from top to bottom

? keyword bottom find keywords

N Next

N Previous

Tail and head

-N Displays the specified number of rows

Tail Dedicated:-F

function is to view and not exit, you can see what is appended later

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/71/F1/wKiom1XbC1SDWra_AAA1qJyOqVg852.jpg "/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/71/ED/wKioL1XbDWnjWDTjAABBQtQ3A58300.jpg "/>

In another terminal, append content, can be used to view the log for easy troubleshooting

Time Stamp management tool:

Touch command

Each file has three timestamps

Atime time of last visit, such as cat, more, less, etc.

Mtime the last time the content was modified

CTime the last time a property has changed

If no option is added, the three timestamp is updated to the current time

-A only modifies atime

-M modifies CTime while CTime is updated

-T Specify timestamp

Do not create when the-C file does not exist

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/71/F1/wKiom1XbC1ThMPxoAAGj43tGlVE436.jpg "/>

Timestamp format: Month day time. seconds

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/71/F1/wKiom1XbC1XiOCWAAACVLCHPVCs029.jpg "/>

If no option is added and the file does not exist, the file is created, plus-C does not create

File Management:

CP, MV, RM

CP command

-R Recursive replication

-D does not track symbolic links

-A equals-DR--preserve=all (Reserved attribute)

-I interactive reminders

-F Mandatory

-V Display procedure

MV Command

-I interactive reminders

-F Mandatory

RM command

-R recursion

-F Mandatory

-I interactive reminders

8.23 Lesson-2