When you use the vi or ex
:tag command, the more
:t command, or the ex,
more, or vi
For C source code, the tags file may contain tags for function definitions, pre-processor macro definitions, and typedef definitions. For FORTRAN source code, the tags file may contain tags for function and subroutine definitions.
For each tag, the tags file contains one line in the following form:
tagname sourcefile address
The tagname field is the name of the C function, macro, or typedef or the name of the FORTRAN function or subroutine. The sourcefile field has the name of the source file containing the tag named tagname. The address field is an editor address within sourcefile to reach the tag definition. This is either a line number in the file or a regular expression (enclosed in ? or / characters) that uniquely matches the line of source code where the tag appears. A tab character separates each field.
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