Change file timestamps, change the access and/or modification times of the specified files.

Syntax
      touch [options]... File...

Options

-a
--time=atime
--time=access
--time=use
     Change the access time only.

-c
--no-create
     Do not create files that do not exist.

-d
--date=time
     Use time instead of the current time.  It can contain month names,
     timezones, `am' and `pm', etc.

-f   Ignored; for compatibility with BSD versions of `touch'.

-m
--time=mtime
--time=modify
     Change the modification time only.

-r FILE
--reference=FILE
     Use the times of the reference FILE instead of the current time.

-t [[CC]YY]MMDDhhmm[.ss]
     Set to a specific time.

The -t argument will accept four-digit or two-digit years, specifying the seconds is optional. If no digits of the year are specified, the argument is interpreted as a date in the current year.

If two-digit year is specified, then CC is 20 for years in the range 0 … 68, and 19 for year in 69 … 99.

If the first FILE would be a valid argument to the `-t’ option and no timestamp is given with any of the `-d’, `-r’, or `-t’ options and the `–‘ argument is not given, that argument is interpreted as the time for the other files instead of as a file name.

Any FILE that does not exist is created empty.

If changing both the access and modification times to the current time, `touch’ can change the timestamps for files that the user running it does not own but has write permission for. Otherwise, the user must own the files.

Examples

Create/datestamp one file called sample.txt:

touch sample.txt

Create/datestamp 10 files called file1, file2 etc:

touch file{1,2,3,4,5,6,7,8,9,10}

Create/datestamp 100 files called file1, file2 etc:

for i in $(seq 1 100); do echo -n “file${i} “; touch file${i} 2>&1; done

Related linux commands:

chgrp – Change group ownership
chmod – Change access permissions
chown – Change file owner and group
date – Display or change the date
which – Show full path of commands
Equivalent Windows commands: TOUCH – Change file timestamps

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