Add `retens', the user frontend for MTRETENS.

svn path=/head/; revision=13348

usr.bin/mt/mt.1

@@ -89,6 +89,9 @@ Rewind the tape and place the tape unit off-line
 .It Cm erase
 Erase the tape
 (Count is ignored).
+.It Cm retens
+Re-tension the tape
+(one full wind forth and back, Count is ignored).
 .It Cm status
 Print status information about the tape unit.
 .It Cm blocksize

usr.bin/mt/mt.c

@@ -94,6 +94,7 @@ struct commands {
 	{ "density",	MTSETDNSTY, 0, NEED_2ARGS|ZERO_ALLOWED|IS_DENSITY },
 	{ "eom",	MTEOD, 1 },
 	{ "comp",	MTCOMP, 0, NEED_2ARGS|ZERO_ALLOWED },
+	{ "retens",	MTRETENS, 1 },
 #endif /* defined(__FreeBSD__) */
 	{ NULL }
 };