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-.TH REVPATH 1 __vendorversion__
-.SH NAME
-revpath \- generate a relative path that can be used to undo a change-directory
-.SH SYNOPSIS
-.B revpath
-.I path
-.SH DESCRIPTION
-The
-.I revpath
-program prints out a relative path that is the ``reverse'' or ``inverse'' of
-.IR path .
-Start with two directories
-.I top
-and
-.IR bottom ,
-with the latter below the former, and
-.I path
-is the location of
-.I bottom
-relative to
-.IR top .
-The output of
-.I revpath
-is the location of
-.I top
-relative to
-.IR bottom .
-The resulting path contains a trailing `/' character when the result is
-non-trivial.
-If
-.I path
-is equivalent to `.', the resulting output is empty.
-If
-.I path
-is invalid in some way (e.g., doesn't represent the path to a subdirectory)
-the output is also empty and no error messages are ever generated.
-.SH DIAGNOSTICS
-There are no diagnostics. Error conditions are silently ignored, and the
-exit status is always 0.
-.SH BUGS
-It isn't possible to reverse arbitrary relative paths.
-If any path element between the two end points of
-.I path
-is a symbolic link, the results will probably be incorrect.