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linenum(4)
NAME
  linenum - Line number entries in an object file

DESCRIPTION
  When invoked with the -g option, the cc(1) command generates an entry in
  the object file for each C source line on which a breakpoint is possible.
  Users can then reference line numbers when debugging. (See dbx(1).)

RELATED INFORMATION
  a.out(4), cc(1), dbx(1), syms(4)