Linux basic command-touch

Touch

Modify the access time and modification time of the file to the current time. If the specified file does not exist, an empty file will be created unless the-c or-h option is specified. The file parameter string'-'is specially processed and causes touch to change the time of the file associated with standard output.

The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.

1. Grammar

Touch [options] file

2. List of options

Option

Description

-- help

Show help documentation

-- version

Display version information

-a

Only change the visit time

-c |-- no-create

Do not create a file

-d |-- date=time

Set to the specified time instead of the current time

-f

ignore

-h

Change only symbolic links

-m

Only change the modification time

-r |-- reference=file

The time to use the specified file

-t

Use CCYYMMDDhhmmss time

-- time=WORD

Change the specified time: Word to access, atime or use

"--date=STRING" is one of the main free-form human-readable date strings, such as "Sun, February 29th 16:21:42-0800" or "2004-02-29 16pur21VOL21", or even "next Thursday". The date string may contain items that indicate calendar date, daily time, time zone, midweek day, relative time, relative date, and number. An empty string represents the beginning of the day.

3. Examples

1) create a file

[root@localhost weijie] # ls / / File does not exist

1.c 1.c ~ 2.c 3.c 4.c 4.c ~ 5.c Tsplitaa Tsplitab Tsplitac Tsplitad xaa xab xac

[root@localhost weijie] # touch-c 6.c / / use option-c, do not create files

[root@localhost weijie] # ls

1.c 1.c ~ 2.c 3.c 4.c 4.c ~ 5.c Tsplitaa Tsplitab Tsplitac Tsplitad xaa xab xac

[root@localhost weijie] # touch 6.c / / create a file without using any options

[root@localhost weijie] # ls

1.c 1.c ~ 2.c 3.c 4.c 4.c ~ 5.c 6.c Tsplitaa Tsplitab Tsplitac Tsplitad xaa xab xac

2) modify the target file time with the specified file

[root@localhost weijie] # ll 1.c 2.c / / time to view files

-rwxr--r-- 1 root david 50 September 14 10:07 1.c

-rwxr--r-- 1 root root 13 September 16:52 2.c

[root@localhost weijie] # touch-r 2.c 1.c / / modify the time of 1.c to 2.c

[root@localhost weijie] # ll 1.c 2.c / / time to view files

-rwxr--r-- 1 root david 50 September 13 16:52 1.c

-rwxr--r-- 1 root root 13 September 16:52 2.c

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