Update shell-and-data-access.md

docs.it4i/general/shell-and-data-access.md

@@ -176,11 +176,10 @@ Then run the rsync in parallel:
 
 ```console
 local $ cd my-local-dir
-local $ ls | xargs -I% -n 2 -P 4 rsync % username@cluster-name.it4i.cz:my-remote-dir/.
+local $ ls | xargs -I% -n 1 -P 4 rsync % username@cluster-name.it4i.cz:my-remote-dir/.
 ```
 
-The -n XXX argument determines how many files will be transfered per single rsync process. The -P YYY argument
-determines number of parallel rsync processes. Set to number of cores on your local machine.
+The -P YYY argument determines number of parallel rsync processes. Set to number of cores on your local machine.
 
 On Windows, use the [WinSCP client][c] to transfer data. The [win-sshfs client][d] provides a way to mount the cluster filesystems directly as an external disc.