What does $$ mean in Unix?

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Tags

  1. #prompt
  2. #ready
  3. #called
  4. #commands
  5. #interface
  6. #typed
  7. #means
  8. #presents
  9. #program
  10. #accept
  11. #variety
  12. #there
  13. #shell
  14. #dollar
  15. #system