CheckDouble will
   1) check whether there are duplicate command names in your path
   2) check whether there are two identical files in your path with
      different names
CheckDouble requires at least OS2.0, and knows about links.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1851    2712  68.3% -lh5- 3497 Feb  5  1994 CheckDouble
[generic]                 2256    9670  23.3% -lh5- f0aa Feb  5  1994 CheckDouble.c
[generic]                 1204    2604  46.2% -lh5- af3b Feb  5  1994 CheckDouble.doc
[generic]                 1304    1988  65.6% -lh5- bec9 Feb  5  1994 CheckDouble39
[generic]                  233     505  46.1% -lh5- 8a2f Feb  5  1994 files
[generic]                  316     911  34.7% -lh5- b89a Feb  5  1994 Makefile
[generic]                  919    2269  40.5% -lh5- fca6 Jan 16  1994 MyStartup.a
[generic]                  282     450  62.7% -lh5- 2cf7 Jul 10  1992 MyStartup.h
[generic]                  368     524  70.2% -lh5- dd14 Jan 16  1994 MyStartup.o
[generic]                 6993   17982  38.9% -lh5- dc3e Jun  2  1991 copying
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        10 files   15726   39615  39.7%            Feb 10  1994