Prints to standard output a detailed usage description. Append the tags to an existing tag file. Include macro definitions in the output file. Use of -i is preferred. Ctags will stubbornly refuse to take orders if tagfile exists and its first line contains something other than a valid tags line.
Types is a group of letters designating the types of tags affected.
The list may be supplied directly on the command line or found in a separate file. This feature is useful when preprocessor macros are used in such a way that they cause syntactic confusion due to their presence. Some examples will illustrate this point. In fact, this seeming function definition would likely cause the rest of the file to be skipped over while trying to complete the definition. Places into the tag file line numbers in the source file where tags are located rather than patterns to be searched for.