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diff --git a/biology/ucsc-userapps/files/kent.c b/biology/ucsc-userapps/files/kent.c
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+/***************************************************************************
+ *  Description:
+ *      Wrapper to turn ucsc kent commands into subcommands.  The kent suite
+ *      contains executables that conflict with multiple other software
+ *      packages and therefore cannot be safely installed directly under a
+ *      standard prefix.  This wrapper can be installed under the standard
+ *      PATH and used to to execute kent commands installed under a
+ *      private prefix, without altering PATH, activating a special
+ *      environment, opening a container, etc.  This sub-command paradigm
+ *      is already familiar to bioinformaticians thanks to other suites
+ *      like samtools, bedtools, etc.
+ *
+ *      Example:
+ *
+ *          kent bigWigToBedGraph args
+ *
+ *      instead of one of the following:
+ *
+ *          prefix/bin/bigWigToBedGraph args
+ *
+ *          env PATH=prefix/bin:$PATH bigWigToBedGraph args
+ *
+ *          conda activate kent
+ *          bigWigToBedGraph args
+ *
+ *  Arguments:
+ *      The full kent utils command you would use if it were in PATH.
+ *
+ *  Compile with UCSC_PREFIX set to the parent of the bin directory
+ *  containing the kent binaries.
+ *
+ *  History: 
+ *  Date        Name        Modification
+ *  2021-09-13  Jason Bacon Begin
+ ***************************************************************************/
+
+#include <stdio.h>
+#include <sysexits.h>
+#include <limits.h>
+#include <unistd.h>
+
+#ifndef UCSC_PREFIX
+#define UCSC_PREFIX   "/usr/local/userapps"
+#endif
+
+int     main(int argc,char *argv[])
+
+{
+    char    cmd[PATH_MAX + 1];
+
+    if ( argc < 2 )
+    {
+        fprintf(stderr, "Usage: %s UCSC-userapps-command [args]\n", argv[0]);
+        return EX_USAGE;
+    }
+    
+    snprintf(cmd, PATH_MAX, "%s/bin/%s", UCSC_PREFIX, argv[1]);
+    execv(cmd, argv + 1);
+}