Here are the most needed cases when you need to FIND something in your server:

1. You want to see the first 50 biggest files in the current location:

find . -xdev -type f -ls | sort +6n | tail -n 50

2. You want to all the files which were created TODAY in this specific partition:

find . -mtime -1 -type f -xdev -exec ls -l {} \;

If some user does not remember his password, and is asking you to change it, you can do it via the command:

passwd username

But even if you set new password the user still