Linux timestamp management ——— Touch command

Touch create file or update file timestamp
Format: Touch parameter file name

Parameters:

-C: Do not create a file that does not exist

-M: Update only modified time, not update access time

-A: Update access time only, not update modification time

-R file: Time to update files using file files

-T: Modifies the time to the date specified by the parameter, such as 01091135 for January 9 11:35

Additional Knowledge: View file information (created date): Ls-l View file information (access date): Ls-lu

[[email protected] 123]# tree                       //confessed to the experimental environment, which has the following folders and files .├── 1234│    └── 12345├── 1.txt├── 2├── 2.txt└── 3.txt2 directories, 4  files[[email protected] 123]# touch -c a.txt           //If there is a.txt, update its timestamp, and if not, do not create [[email protected] 123]# ls1234   1.txt  2  2.txt  3.txt[[email protected] 123]# ls -l 1. Txt-rw-r--r--.  1 root root 9 May  4 15:04 1.txt[[email  Protected] 123]# touch -c 1.txt[[email protected] 123]# ls -l 1. Txt-rw-r--r--.  1 root root 9 May  4 16:21 1.txt[[email  protected] 123]#  Ls -lu 1.txt-rw-r--r--.  1 root root 9 may  4 16:21 1. Txt[[email protected] 123]# touch -a 1.txt[[email protected] 123]# ls  -lu 1.txt-rw-r--r--.  1 root root 9 may  4 16:23 1.txt[ [Email protected] 123]# ls -l 2.txt-rw-r--r--.  1 root root 9  apr  5 05:17 2.txt[[email protected] 123]# touch -r 2.txt  1.txt[[email protected] 123]# ls -l 2.txt-rw-r--r--.  1 root root  9 Apr  5 05:17 2.txt[[email protected] 123]# touch -t  03301259 1.txt[[email protected] 123]# ls -l 1.txt-rw-r--r--.  1 root  root 9 mar 30 12:59 1.txt[[email protected] 123]#

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Linux timestamp management ——— Touch command