14.7. Emacs Users

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If users develop application codes on UNIX machines using Emacs (which we highly recommend), the etags feature can be used to search PETSc files quickly and efficiently. To use this feature, one should first check if the file, ${}PETSC_DIR/TAGS exists. If this file is not present, it should be generated by running make etags from the PETSc home directory. Once the file exists, from Emacs the user should issue the command

 M-x visit-tags-table 
where `` M'' denotes the Emacs Meta key, and enter the name of the TAGS file. Then the command `` M-.'' will cause Emacs to find the file and line number where a desired PETSc function is defined. Any string in any of the PETSc files can be found with the command `` M-x tags-search''. To find repeated occurrences, one can simply use `` M-,'' to find the next occurrence.


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