Find [path] [expression]
Recursively finds files in path that match the expression. If no arguments, it finds all files in the current directory
find -name pattern
Find files and directories that match pattern
find -iname pattern
Like -name, but ignores case
find -ls
Performs ls on each item found
find -mtime days
Find files that are days old
find -size +(size)
Find files that are if size num
find -newer file
Find files newer than this file
-exec command {}
Run command against all found files
Example
find /etc -type d -newer /etc/passwd
locate pattern
Lists files that match the pattern.
Faster than find