One Linux command per day (9): Touch

1. Introduction to Commands

The Touch command changes the access time and modification time for each file to the current time.

2. Usage

Touch [Options] ... File...

3. Options

  -A            only change the access  time -C,--no-    Create creates no  file -D,--Date= string    Use the specified string to represent the time instead  of the current time -F  (Ignore)-H,--no-dereference affects the        symbolic link itself, not the destination indicated by the symbolic link (This option is useful when the system supports changing the owner of a symbolic link  .) -m            only changes the modified  time -R, the--reference= file    uses the specified file's time attribute  instead of the current time -t STAMP        uses the [ [CC] YY]MMDDHHMM[.SS] Format time instead of the current time   -time=word        using WORD: Access, atime, use equals-the effect of the-a option , while modify, Mtime equals The effect of the-m option

4. Instance 1: Create an empty file in the current directory A.log

Touch010 April  : A.log

Example 2: Update A.log modification time is current time

0 1 0 April  :touch01 0 April  : A.log

Example 3: Update Log1.log time and Log2.log timestamp same

[[email protected] dir1]# ll total dosage0-rw-r--r--1Root root0April -  +: ,A.log-rw-r--r--1Root root0April -  +: AB.log[[email protected] dir1]#Touch-r a.log B.log [[email protected] dir1]# ll total dosage0-rw-r--r--1Root root0April -  +: ,A.log-rw-r--r--1Root root0April -  +: ,B.log

Example 4: Setting the timestamp of a file

[[email protected] dir1]# ll total dosage0-rw-r--r--1Root root0April -  +: ,A.log[[email protected] dir1]#Touch-T201601011200.50Log.log[[email protected] dir1]# ll total dosage0-rw-r--r--1Root root0April -  +: ,A.log-rw-r--r--1Root root0January1  A:xxLog.log

One Linux command per day (9): Touch