touch - is a standard Unix program used to change a file's access and modification timestamps. It is also used to create a
new empty file.
-a, change the access time only
-c, if the file does not exist, do not create it and do not
report this condition
-d date_time, use the date_time specified to update the access and
modification times
-m, change the modification time only
-r file, use the access and modification times of file
-t time, use the time specified (in the format below) to update
the access and modification times
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