search for files in a directory hierarchy

find [-H] [-L] [-P] [-D debugopts] [-Olevel] [path...] [expression]

-user uname
       File is owned by user uname (numeric user ID allowed).

-group gname
       File belongs to group gname (numeric group ID allowed).

-size n[cwbkMG]
       File uses n units of space.  The following suffixes can be used:

       `b'    for 512-byte blocks (this is the default if no suffix is used)

       `c'    for bytes

       `w'    for two-byte words

       `k'    for Kilobytes (units of 1024 bytes)

       `M'    for Megabytes (units of 1048576 bytes)

       `G'    for Gigabytes (units of 1073741824 bytes)

       The  size  does  not  count indirect blocks, but it does count blocks in sparse files that are not
       actually allocated.  Bear in mind that the `%k' and  `%b'  format  specifiers  of  -printf  handle
       sparse  files  differently.   The  `b'  suffix always denotes 512-byte blocks and never 1 Kilobyte
       blocks, which is different to the behaviour of -ls.