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       chktri - check for trigraphs in C source code


       chktri [file ...]


       This  program  looks  for  lines containing trigraphs in C source code.
       Trigraphs are a way to represent certain characters in C source code as
       two  question  marks  and  a third character.  For example, a backslash
       could be represented as ‘??/’.  For a detail specification, see section in the ISO 9899:1990 standard or any decent C book.  (You don’t
       really want to know.)


       Lars Wirzenius,