What is the difference between local file system commands touch and touchz

Question

 I am new to Hadoop and starting working on few commands and I am trying to create a new file in linux terminal. What is the difference between

[edureka@localhost ~]$touch file.txt

and

[edureka@localhost ~]$hadoop fs -touch**z** file.txt.

Why in a local file system for creating a new file touch is used and why in the Hadoop file system for creating a new file touchz is used

Answer 1

Actually they both do the same except touchz is setting to a file timestamp of the folder where is created. From the source code of touchz:

Creates a file of zero length at path with current time as the timestamp of that path. An error is returned if the file exists with non-zero length

Both can be used for creating files. However, touch can be also used to update the modification date (timestamp) of a file.

If you also wish to update the timestamp of a file on Hadoop, you can use setTimes.