mountpoint - see if a directory or file is a mountpoint
mountpoint [-d|-q] directory|file
mountpoint -x device
mountpoint checks whether the given directory or file is mentioned in the /proc/self/mountinfo file.
mountpoint has the following exit status values:
The util-linux mountpoint implementation was written from scratch for libmount. The original version for sysvinit suite was written by Miquel van Smoorenburg.
Karel Zak <email@example.com>
For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.
The mountpoint command is part of the util-linux package which can be downloaded from Linux Kernel Archive https://www.kernel.org/pub/linux/utils/util-linux/.