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时间戳问题可以更改系统时间，也可以更改文件的修改时间

sudo date -s ‘20160727 18:51:56’ //sudo date -s 20160727 //sudo date -s 18:51:56 Usage: touch [OPTION]… FILE… Update the access and modification times of each FILE to the current time.

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) -m change only the modification time //sudo touch -m filename //sudo touch -m ./* -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.

If a FILE is -, touch standard output.

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