Bernhard Fischer provided a mountpoint(1) applet. This is apparently something
sysvinit provides, and which is used by the debian init scripts.
diff --git a/include/usage.h b/include/usage.h
index dc8058a..6622278 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -1922,6 +1922,20 @@
"$ mount /dev/fd0 /mnt -t msdos -o ro\n" \
"$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
+#define mountpoint_trivial_usage \
+ "[-q] <[-d] DIR | -x DEVICE>"
+#define mountpoint_full_usage \
+ "mountpoint checks if the directory is a mountpoint\n\n" \
+ "Options:\n" \
+ "\t-q:\t\tBe more quiet\n" \
+ "\t-d:\t\tPrint major/minor device number of the filesystem\n" \
+ "\t-x:\t\tPrint major/minor device number of the blockdevice"
+#define mountpoint_example_usage \
+ "$ mountpoint /proc\n" \
+ "/proc is not a mountpoint\n" \
+ "$ mountpoint /sys\n" \
+ "/sys is a mountpoint\n"
+
#define mt_trivial_usage \
"[-f device] opcode value"
#define mt_full_usage \