-a

change only the access time

-c

do not create any files

-d

parse STRING and use it instead of current time

-h

affect each symbolic link instead of any referenced file (useful only on systems that can change thetimestamps of a symlink)

-m

change only the modification time

-r

use this file's times instead of current time

-t

use [[CC]YY]MMDDhhmm[.ss] instead of current time

--time

change the specified time: WORD is access, atime, or use: equivalent to -a WORD is modify or mtime:equivalent to -m

--help

display this help and exit

--version

output version information and exitNote that the -d and -t options accept different time-date formats.DATE STRINGThe --date=STRING is a mostly free format human readable date string such as "Sun, 29 Feb 2004 16:21:42 -0800"or "2004-02-29 16:21:42" or even "next Thursday". A date string may contain items indicating calendar date,time of day, time zone, day of week, relative time, relative date, and numbers. An empty string indicates thebeginning of the day. The date string format is more complex than is easily documented here but is fullydescribed in the info documentation.AUTHORWritten by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith.REPORTING BUGSGNU coreutils online help: <http://www.gnu.org/software/coreutils/>Report touch translation bugs to <http://translationproject.org/team/>COPYRIGHTCopyright © 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later<http://gnu.org/licenses/gpl.html>.This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent per‐mitted by law.