mountpoint
Check whether the directory or device is a mountpoint. toybox
On Linux
Linux
mountpoint [-qd] DIRmountpoint [-qx] DEVICE
-qBe quiet, return zero if directory is a mountpoint-dPrint major/minor device number of the directory-xPrint major/minor device number of the block deviceLinux
Test if a directory is a filesystem mountpoint.
Check if a directory is a mountpoint
mountpoint path/to/directoryIdentifyCheck if a directory is a mountpoint without showing any output
mountpoint --quiet path/to/directoryIdentifyShow major/minor numbers of a mountpoint's filesystem
mountpoint --fs-devno path/to/directoryIdentify