$ locate filename

$ locate "*.html"

$ locate "*.php" -n 10

$ locate "*.php" | more

$ sudo updatedb

$ find / -name 'index.php'

$ find / -name 'index.php' 2>/dev/null
$ find / -name 'index.php' 2>errors.txt

$ find /home/saeid -name 'index*'
$ find /home/saeid -iname 'index*'

$ find -name s*

$ find /home/saeid/Music -name '*.mp3' -size -5000k
$ find / -size +10000k

$ find /home/saeid -amin -10 -name '*.php'
$ find /home/saeid -atime -2 -name '*.php'
$ find /home/saeid -mmin -10 -name '*.php'
$ find /home/saeid -mtime -2 -name '*.php'

$ find / -mount -name 'win*'

$ find /home/saeid/Music -name 'Metallica*' -and -size +10000k
$ find /home/saeid/Music -size +10000k ! -name "Metallica*"
$ find /home/saeid/Music -name 'Metallica*' -or -size +10000k

$ find / - name 'Metallica*' -exec ls -lh {} \;

$ wheris nano

$ which nano

grep -r root /etc/passwd

find -type d -name "filename"

find -perm -u=s

find -perm 777