Linux Touch Command

The role of the Touch command is to create a new blank file and access (access) and modify (modify) timestamp for the file that is updated

View Help for Touch

Note: Modify changes to the contents of the file, regardless of whether access or modify changes, will result in changes in change time, because no matter which operation will cause the file's properties (change times) changes.

Mans Touch

How to use man:

Touch [OPTION] ... FILE ...

Options

-A change only the access time for the file to be modified

-C do not create a file, only modify the file timestamp

-D Modify the timestamp to the specified time

-M Modify File modification time

-R Modify access and modify (modify) timestamps as a reference to a file

-T STAMP modify the timestamp to the specified time

use [[CC]YY]MMDDHHMM[.SS] instead of the current time

Example

Touch update already has file time

First, use the Stat command to view the timestamp of the file

[Email protected]~]# stat test.txt

File: ' Test.txt '

size:0 blocks:0 IO block:4096 Regular empty file

device:803h/2051d inode:1399408 links:1

Access: (0644/-rw-r--r--) Uid: (0/root) Gid: (0/root)

access:2017-03-31 16:57:32.000000000 +0800

modify:2017-03-31 16:57:32.000000000 +0800

change:2017-03-31 16:57:32.000000000 +0800

[Email protected] oldboy]# touch-a test.txt

[Email protected] oldboy]# stat test.txt

File: ' Test.txt '

size:0 blocks:0 IO block:4096 Regular empty file

device:803h/2051d inode:1399408 links:1

Access: (0644/-rw-r--r--) Uid: (0/root) Gid: (0/root)

access:2017-03-31 17:00:14.000000000 +0800

modify:2017-03-31 16:57:32.000000000 +0800

change:2017-03-31 17:00:14.000000000 +0800

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Linux Touch Command