If you are not familiar with the find command, check out our Getting Started article.

The find command may produce many results with the text "Permission Denied."

~]# find / -iname jar
find: '/run/user/1000/gvfs': Permission denied
. . . 

Appending 2>/dev/null will exclude the results that contain Permission Denied from the output.

~]# find / -iname jar 2>/dev/null
/opt/bin/jar