Search files with file size or day in UNIX

To find files equal to 10KB in src directory,

find src -size 10k

To find files larger that 10KB in src directory,

find src -size +10k

To find file less than 10KB in src directory,

find src -size -10k

To find file was modified for 2 days in src directory,

find src -mtime 2

To find file was modified for less than 2 days in src directory,

find src -mtime -2