- name
/ root directory 
. current directory

find / -name '*.c"

-perm (r-xr-xr-x)

find / -perm 555 

-type
b : block device
c : character divice
d : directory
l  : symbolic link
p : pipe
s : socket

find . -type d

-atime (access time)
find . -atime +30 -type d

-ctime (changed time)
find . -ctime -10

-mtime (modified time)

-user (user own's file)
find / -user aaa

-group
find . -group test123

-empty ( empty file or directory)

-exec (if it find files, execute these)

- exec command {} ;

find . -name "[A]*" - print

find . -name 'next*' -print