Display a useful command to repeat a test if one fails.

scripts/encodedecodetest.sh

@@ -8,9 +8,9 @@ script="$4"
 flags="$5"
 dir="$6"
 
-srcfile=$dir.$format.src.img
-fluxfile=$dir.$format.$ext
-destfile=$dir.$format.dest.img
+srcfile=$dir/src.img
+fluxfile=$dir/flux.$ext
+destfile=$dir/dest.img
 
 dd if=/dev/urandom of=$srcfile bs=1048576 count=2 2>&1
 
@@ -24,6 +24,8 @@ fi
 truncate $srcfile -r $destfile
 if ! cmp $srcfile $destfile; then
 	echo "Comparison failed!" >&2
+	echo "Run this to repeat:" >&2
+	echo "./scripts/encodedecodetest.sh \"$1\" \"$2\" \"$3\" \"$4\" \"$5\" \"$6\"" >&2
 	exit 1
 fi
 exit 0