diff -Nburp tcsh-6.20.00.orig/sh.c tcsh-6.20.00/sh.c

--- tcsh-6.20.00.orig/sh.c	2016-09-12 19:33:54.000000000 +0300

+++ tcsh-6.20.00/sh.c	2017-07-18 11:04:32.963868814 +0300

@@ -836,7 +836,7 @@ main(int argc, char **argv)

 	const char *tmpdir = getenv ("TMPDIR");

 	if (!tmpdir)

 	    tmpdir = "/tmp";

-	shtemp = Strspl(SAVE(tmpdir), SAVE("/sh" TMP_TEMPLATE)); /* For << */

+	shtemp = Strspl(SAVE(tmpdir), SAVE("/tcsh" TMP_TEMPLATE)); /* For << */

     }

 #else /* !HAVE_MKSTEMP */

     shtemp = Strspl(STRtmpsh, doldol);	/* For << */