Ctags is a Linux utility that generates an index (or tag) file of language objects found in source files. This index file allows you to quickly and easily navigate to the definition of a function, variable, or other language construct in your source code. Here are some examples of how to use the ctags command:

• To generate a tags file for all source files in the current directory and its subdirectories, use the following command: ctags -R . This will recursively scan the directory for files and generate a “tags” file that can be used to navigate the source code.
• To generate a tags file for a specific file, use the following command: ctags filename.c
• To generate a tags file for specific language, use the following command: ctags -R --languages=python
• To search for a specific tag, you can use the following command: ctags -R --list-tags='tagname'
• To generate tags files for many files by including/excluding with specific path, you can use the following command: ctags -R --exclude='*.pyc' --exclude='*.log' /path/to/src
• To specify output tag file, you can use the following command: ctags -R -f tags_file /path/to/src

Please note that the above examples are simplified and ctags has many arguments that allow to tailor the generation of the tags file. It is important to know that the options may vary for different ctags implementation, for example, the syntax for exhuberant-ctags is different than the Universal-ctags.

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230. Linux Commands and Examples