EXPAND_TILDE()

       Expand tilde in UNIX directory names

       IDL> output=expand_tilde(input)

       INPUT = input file or directory name, scalar string

       Returns expanded filename, scalar string

       output=expand_tilde('~zarro/test.doc')
               ---> output='/usr/users/zarro'

       This version of EXPAND_TILDE differs from the version in the Solar
       Library in that it does not call the functions EXIST and IDL_RELEASE.
       However, it should work identically.

       None.

       Version 1,  17-Feb-1997,  D M Zarro.  Written
       Transfered from Solar Library   W. Landsman   Sep. 1997
       Made more robust  D. Zarro/W. Landsman  Sep. 2000
       Made even more robust (since things like ~zarro weren't being expanded)
       Zarro (EITI/GSFC, Mar 2001)

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