Standard Input, Output, and ErrorRedirecting Standard OutputGroup CommandsRedirecting Standard ErrorRedirecting Standard Output and Standard Error to One FileDisposing of Unwanted OutputRedirecting Standard Inputcat—Concatenate FilesPipelinesFiltersuniq—Report or Omit Repeated Lineswc—Print Line, Word, and Byte Countsgrep—Print Lines Matching a Patternhead/tail—Print First/Last Part of Filestee—Read from Stdin and Output to Stdout and FilesSumming Up