### Question 19.31

How can my program discover the complete pathname to the executable from which it was invoked?

`argv[0]` may contain all or part of the pathname, or it may contain nothing. You may be able to duplicate the command language interpreter's search path logic to locate the executable if the name in `argv[0]` is present but incomplete. However, there is no guaranteed solution.

References: K&R1 Sec. 5.11 p. 111
K&R2 Sec. 5.10 p. 115
ANSI Sec. 2.1.2.2.1
ISO Sec. 5.1.2.2.1
H&S Sec. 20.1 p. 416

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