Linux CP Basic Command Summary

user command:Touch-chang file Timestamps This command is rarely used

1. command format:

Touch [ options ] ... file

2. command parameters:

-A change only the access time just change the access time

-C do not create any files do not create any files

- D parse STRING and use it instead of currenttime parse the string and use it instead of the current time

- F Ignore

- h affect eachsymbolic link instead of any referenced file affect each symbolic connection, not the referenced file

- m change onlythe modification time just modify the time

- R Specifies the date and time of the document or directory to be set to the date and time corresponding to the reference document or directory

-T uses the specified date time instead of the current time

3 , command function:

Touch command parameters can change the date time of a document or directory, including access time and change time

4. Examples of use:

Example one: Creating Yema1.log and Yema2.log

Command:

[Email protected]~]# ls

51cto auto Baidu Install.log log2013.log test

Anaconda-ks.cfg auto1 baidu1 install.log.syslog log2014.log yema1

[Email protected]~]# Touch Yema1.log Yema2.log

[Email protected]~]# ll

Total 76

drwxr-xr-x.2 root root 4096 Dec 14:51 51cto

-RW-------. 1 root root 1295 Dec 23:32anaconda-ks.cfg

drwxr-xr-x.3 root root 4096 Dec 14:54 auto

drwxr-xr-x.2 root root 4096 Dec 14:58 auto1

drwxr-xr-x.2 root root 4096 Dec 10:19 Baidu

drwxr-xr-x.3 root root 4096 Dec 10:19 baidu1

-rw-r--r--. 1 root root 28865 Dec 23:32 Install.log

-rw-r--r--. 1 root root 7572 Dec 23:30install.log.syslog

-rw-r--r--. 1 root root 0 Dec 16:27log2013.log

-rw-r--r--. 1 root root 0 Dec 16:27log2014.log

drwxr-xr-x.2 root root 4096 Dec 09:51 test

drwxr-xr-x.3 root root 4096 Dec 09:45 yema1

-rw-r--r--. 1 root root 0 Dec 16:29 yema1.log

-rw-r--r--. 1 root root 0 Dec 16:29 yema2.log

[Email protected]~]# ls

51cto auto1 Install.log Log2014.log yema1.log

anaconda-ks.cfg Baidu Install.log.syslog Test Yema2.log

Auto BAIDU1 log2013.log yema1

If the yema3.log does not exist, do not create the file, using the-c parameter, the command is as follows:

[Email protected] ~]# touch-c Yema3.log

[email protected] ~]# LL

Total 76

Drwxr-xr-x. 2 root root 4096 Dec 14:51 51cto

-RW-------. 1 root root 1295 Dec 23:32 anaconda-ks.cfg

Drwxr-xr-x. 3 root root 4096 Dec 14:54 auto

Drwxr-xr-x. 2 root root 4096 Dec 14:58 auto1

Drwxr-xr-x. 2 root root 4096 Dec 10:19 Baidu

Drwxr-xr-x. 3 root root 4096 Dec 10:19 baidu1

-rw-r--r--. 1 root root 28865 Dec 23:32 Install.log

-rw-r--r--. 1 root root 7572 Dec 23:30 install.log.syslog

-rw-r--r--. 1 root root 0 Dec 16:27 log2013.log

-rw-r--r--. 1 root root 0 Dec 16:27 log2014.log

Drwxr-xr-x. 2 root root 4096 Dec 09:51 test

Drwxr-xr-x. 3 root root 4096 Dec 09:45 yema1

-rw-r--r--. 1 root root 0 Dec 16:29 yema1.log

-rw-r--r--. 1 root root 0 Dec 16:29 yema2.log

Instance two: Update Yema1.log time and Yema2.log timestamp same

Using the-R parameter

The command is as follows:

[email protected] ~]# LL

Total 76

Drwxr-xr-x. 2 root root 4096 Dec 14:51 51cto

-RW-------. 1 root root 1295 Dec 23:32 anaconda-ks.cfg

Drwxr-xr-x. 3 root root 4096 Dec 14:54 auto

Drwxr-xr-x. 2 root root 4096 Dec 14:58 auto1

Drwxr-xr-x. 2 root root 4096 Dec 10:19 Baidu

Drwxr-xr-x. 3 root root 4096 Dec 10:19 baidu1

-rw-r--r--. 1 root root 28865 Dec 23:32 Install.log

-rw-r--r--. 1 root root 7572 Dec 23:30 install.log.syslog

-rw-r--r--. 1 root root 0 Dec 16:27 log2013.log

-rw-r--r--. 1 root root 0 Dec 16:27 log2014.log

Drwxr-xr-x. 2 root root 4096 Dec 09:51 test

Drwxr-xr-x. 3 root root 4096 Dec 09:45 yema1

-rw-r--r--. 1 root root 0 Dec 16:29 yema1.log

-rw-r--r--. 1 root root 0 Dec 16:29 yema2.log

This article is from the "Go to It" blog, make sure to keep this source http://518443.blog.51cto.com/508443/1597370

Linux CP Basic Command Summary