изменить временные метки файла  (change file timestamps)
  
Имя (Name)
touch - change file timestamps
Синопсис (Synopsis)
touch [OPTION]... FILE...
Описание (Description)
Update the access and modification times of each FILE to the
       current time.
       A FILE argument that does not exist is created empty, unless -c
       or -h is supplied.
       A FILE argument string of - is handled specially and causes touch
       to change the times of the file associated with standard output.
       Mandatory arguments to long options are mandatory for short
       options too.
       -a     change only the access time
       -c, --no-create
              do not create any files
       -d, --date=STRING
              parse STRING and use it instead of current time
       -f     (ignored)
       -h, --no-dereference
              affect each symbolic link instead of any referenced file
              (useful only on systems that can change the timestamps of
              a symlink)
       -m     change only the modification time
       -r, --reference=FILE
              use this file's times instead of current time
       -t STAMP
              use [[CC]YY]MMDDhhmm[.ss] instead of current time
       --time=WORD
              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 exit
       Note that the -d and -t options accept different time-date
       formats.
DATE STRING
The --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 the beginning of the day.  The date string format is
       more complex than is easily documented here but is fully
       described in the info documentation.