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What is a filter? (cont)

Example:   cat MyProg.c
  • reads the text of the program in the file MyProg.c
  • writes the (untransformed) text to standard output (i.e. the screen)
Example:   cat < MyProg.c
  • the shell (command interpreter) connects the file MyProg.c to standard input of cat
  • cat reads its standard input
  • writes the (untransformed) text to standard output (i.e. the screen)