Find files in the specified directory

$ find . -name sayboy.txt
$ find /home -name sayboy.txt

Use name ignoring case lookup

$ find /home -iname sayboy.txt

Find a directory by name

$ find /home -type d -name sayboy

Find all PHP files in the directory

$ find . -type f -name "*.php"

Find files with 777 permissions

$ find . -type f -perm 0777 -print

$ find / -type f ! -perm 777

$ find / -perm 2644
$ find / -perm 551
$ find / -perm /u=s
$ find / -perm /g=s
$ find / -perm /u=r
$ find / -perm /a=x

$ find / -type f -perm 0777 -print -exec chmod 644 {} \;
$ find / -type d -perm 777 -print -exec chmod 755 {} \;

Find and delete individual files

$ find . -type f -name "rumenz.txt" -exec rm -f {} \;
$ find . -type f -name "*.txt" -exec rm -f {} \;
$ find . -type f -name "*.mp3" -exec rm -f {} \;

Find all empty files or all empty directories

$ find /tmp -type f -empty
$ find /tmp -type d -empty

$ find /tmp -type f -name ".*"

Find the 50MB file

$ find / -size 50M

$ find / -size +50M -size -100M
$ find / -type f -size +100M -exec rm -f {} \;
$ find / -type f -name *.mp3 -size +10M -exec rm {} \;