Tandy 1000 MS-DOS Reference Manual page 152

Chapter 6 / Command Reference
PATH
PATH
[;][pathname[;pathname ... ]
Internal
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Sets a command path, which tells MS-DOS the directories or
drives in which to search for external commands. MS-DOS
always searches the current directory before it searches the
paths set by PATH. You can also use the PATH command to
remind you of the current path.
Unless you reset the path or turn off the system, MS-DOS
searches the specified path(s) each time you use an external
command.
Parameters
pathname specifies the drives and/or directories in which MS-
DOS searches for external commands.
If
you don't include a
pathname, PATH displays the current path setting. This serves
to remind you which path MS-DOS is searching. If no path is set
(MS-DOS is searching only the current directory), PATH displays
the message No path.
If you specify PATH; (PATH followed by a semi-colon), MS-DOS
resets the search path to null (no path set).
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