find command is used for searching file in directory structure, below are some basic examples for getting started…

• Basic syntax: find directory comparison search-term

• Search file in directory: find ./dir_name -name "*.txt"
  • . represents current directory
  • It will list for file in dir_name directory with .txt extension
• Search file in directory: find ./dir_name -iname "*.txt"
  • -iname search while ignoring case
• Search file in directory: find ./test -not -name "*.txt"
  • Lists all file which don’t have .txt in filename(i.e. list all files execept .txt files)
• Search file modified last N days: find ./dir_name -mtime N
  • File modified in 10 days: find /home/bob -mtime -10
  • File modified in last 10 minutes: find /home/bob -cmin -10
• Find files by file size:
  • Find all file greater than 50MB: find / -size 50M
  • Files greater than 50MB and less than 100MB: find / -size +50M -size -100M
  • Files greater than 50MB and are not debian packages: find / -size +50M ! -name "*.deb" -ls
• Find and exec: You can use find command to list all files with criteria and perform operation on the all the output files.
  • List file with specific criteria and delete them : find ./dir_name -name "*.txt" -exec rm -rf {} \;
    • {}: represent for each output for criteria
    • \; : Termination of command

Reference: http://www.binarytides.com/linux-find-command-examples/