touch
Updates the access and modification times of the file specified by the URI to the current time.
If the file doesn’t exist, then a zero-length file is created at URI with current time as the timestamp of that URI.
The timestamp format is as follows: yyyyMMddHHmmss. Where:
-
yyyy— four digit year (e.g.2018); -
MM— two digit month (e.g.08for August); -
dd— two digit day (e.g.25); -
HH— two digit hour (e.g.12); -
mm— two digit minute (e.g.30); -
ss— two digit second (e.g.00).
Thus, the value 20180825:123000 represents August 25th 2018, 12:30:00 pm.
Returns 0 on success and -1 on error.
The usage is as follows:
$ hadoop fs -touch [-a] [-m] [-t TIMESTAMP] [-c] URI [URI ...]-a |
Changes only the access time |
-m |
Changes only the modification time |
-t |
Specifies a timestamp (in format |
-c |
Doesn’t create file if it doesn’t exist |
Example:
$ hadoop fs -touch -m -t 20180809:230000 pathname
$ hadoop fs -touch -t 20180809:230000 pathname
$ hadoop fs -touch -a pathname