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This is the base name used by a TeX run to identify itself. It is usually the base of the filename of the main source file (e.g. mypaper.tex would, when TeXed, have jobname mypaper) but can also, in the standard implementations of TeX, be set at the command line such as with the switch -jobname. Auxiliary files produced by both TeX and LaTeX will have this as their base name; these include the .log, .aux, and of course, .dvi or .pdf as the output (see File extensions of LaTeX-related files for a list of file extensions associated with a (La)TeX build).

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