Usage of find command.

fine -name     # Find by file name, wild-card is supported
find -amin n   # File was last accessed n minutes ago
find -atime n  # File was last accessed n*24 hours ago
find -mmin n   # File's data was last modified n minutes ago
find -mtime n  # File's data was last modified n*24 hours ago
find -cmin n   # File's status was last changed n minutes ago
find -ctime n  # File's status was last changed n*24 hours ago
find -type f / find -type d    # Find by file type
find -size     # Find by file size
find -user     # Find files are owned by user uname
find -group gname  # Find files belongs to group gname

Find by modified time

find -mtime n
n:  current time - (n + 1) * 24 ~ current time - n * 24
+n: -∞ ~ current time - (n + 1) * 24
-n: current time - n * 24 ~ +∞