revpath



REVPATH(1)                                                          REVPATH(1)




NAME

       revpath  -  generate a relative path that can be used to undo a change-
       directory


SYNOPSIS

       revpath path


DESCRIPTION

       The revpath program prints out a relative path that is the  ‘‘reverse’’
       or  ‘‘inverse’’  of  path.   Start with two directories top and bottom,
       with the latter below the former, and path is the  location  of  bottom
       relative to top.  The output of revpath is the location of top relative
       to bottom.  The resulting path contains a trailing ‘/’  character  when
       the result is non-trivial.  If path is equivalent to ‘.’, the resulting
       output is empty.  If path is invalid in some way (e.g., doesn’t  repre-
       sent  the path to a subdirectory) the output is also empty and no error
       messages are ever generated.


DIAGNOSTICS

       There are no diagnostics.  Error conditions are silently  ignored,  and
       the exit status is always 0.


BUGS

       It  isn’t  possible  to  reverse arbitrary relative paths.  If any path
       element between the two end points of path  is  a  symbolic  link,  the
       results will probably be incorrect.



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