The touch of Linux common commands

Touch: Update file time or create a blank file

1. Command format

Touch [options] File

2. Command function

The intent is to update the timestamp of the file, which is now used to create a blank file.

3. Command parameters

-A: Change access time only

-M: Change only the modified time

-C: Do not create any files

-T: Use the specified date and time instead of the current time

4. Command instances

Example 1: Create a blank file that does not exist

[email protected] ~]# Touch file1

[[email protected] ~]# ls

AA ABC anaconda-ks.cfg Desktop file1 gg install.log install.log.syslog

Example 2: Changing the access time

[Email protected] ~]# stat file1

File: ' File1 '

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

device:803h/2051dinode:2709265 links:1

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

Access:2014-12-21 17:02:49.000000000 +0800

Modify:2014-12-21 17:02:49.000000000 +0800

Change:2014-12-21 17:02:49.000000000 +0800

[Email protected] ~]# touch-a file1

[Email protected] ~]# stat file1

File: ' File1 '

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

device:803h/2051dinode:2709265 links:1

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

Access:2014-12-21 17:05:37.000000000 +0800

Modify:2014-12-21 17:02:49.000000000 +0800

Change:2014-12-21 17:05:37.000000000 +0800

Example 3: Change the modification time

[Email protected] ~]# stat file1

File: ' File1 '

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

device:803h/2051dinode:2709265 links:1

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

Access:2014-12-21 17:05:37.000000000 +0800

Modify:2014-12-21 17:02:49.000000000 +0800

Change:2014-12-21 17:05:37.000000000 +0800

[Email protected] ~]# touch-m file1

[Email protected] ~]# stat file1

File: ' File1 '

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

device:803h/2051dinode:2709265 links:1

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

Access:2014-12-21 17:05:37.000000000 +0800

Modify:2014-12-21 17:07:48.000000000 +0800

Change:2014-12-21 17:07:48.000000000 +0800

Example 4: Do not create any files

[[email protected] ~]# ls

AA ABC anaconda-ks.cfg Desktop file1 gg install.log install.log.syslog

[Email protected] ~]# touch-c file2

[[email protected] ~]# ls

AA ABC anaconda-ks.cfg Desktop file1 gg install.log install.log.syslog

Example 5: Using the specified time

[Email protected] ~]# touch-t 201412211712.30 file2

[Email protected] ~]# stat file2

File: ' File2 '

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

device:803h/2051dinode:2709266 links:1

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

Access:2014-12-21 17:12:30.000000000 +0800

Modify:2014-12-21 17:12:30.000000000 +0800

Change:2014-12-21 17:13:20.000000000 +0800

This article is from the "cold-blooded Killer" blog, please be sure to keep this source http://deathkiller.blog.51cto.com/9130248/1592314

The touch of Linux common commands