The Linux Learning Touch command

The Linux Learning Touch command

 linux's touch commands are typically used to change the date and time of a document or directory, including access time and change time, or create a new file that does not exist. 1. Command format: Touch [options] ... File... 2. Command parameters:-a   or--time=atime or--time=access or--time=use only change the access time. -C   or--no-create do not create any documents. -D uses the specified date time instead of the current time. -F This parameter ignores non-processing and is responsible only for compatibility issues with BSD version touch directives. -M   or--time=mtime or--time=modify only change the change time. -R Sets the date and time of the specified document or directory to the same date and time as the reference document or directory. -T uses the specified date time instead of the current time. --no-create will not create a new file.  --HELP lists the instruction format.  --version lists version messages. 3. Example: The simplest way to use a file is to change the time of recording to the present. If the file does not exist, a new file will be created.  touch File touch file1 File2 changed the time record of file to May 6 18:3, A.D. 2000. The format of the time can be referred to the date instruction, at least input mmddhhmm, is the day of the month and points. Security technology  touch-c-T 05061803 file touch-c-T 050618032000 file changes the file's time record to be the same as referencefile.  touch-r referencefile file changes the file's time record to May 6 18:3, A.D. 2000. Time can use AM, PM or 24 hours format, date can use other formats such as 6 May 2000.  touch-d "6:03pm" file touch-d "05/06/2000" file touch-d "6:03pm 05/06/2000" file Touch can also make an empty file (0 byte ). For example, the/ETC/DHCPD.LEASES,DHCPD required by DHCP server must have this file in order to function properly.  fInd/etc-name *-exec Touch {}; You can update the time of the profile to match the current setting. Set timestamp for file command: touch-t 201211142234.50 log.log  update log.log time and log2012.log timestamp same command: Touch-r log.log log2012.log