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36th chunk of `mount.man`
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 STATUS
       mount has the following exit status values (the bits can be ORed):

       0
           success

       1
           incorrect invocation or permissions

       2
           system error (out of memory, cannot fork, no more loop devices)

       4
           internal mount bug

       8
           user interrupt

       16
           problems writing or locking /etc/mtab

       32
           mount failure

       64
           some mount succeeded

           The command mount -a returns 0 (all succeeded), 32 (all failed), or
           64 (some failed, some succeeded).

EXTERNAL HELPERS
       The syntax of external mount helpers is:

       /sbin/mount.suffix spec dir [-sfnv] [-N namespace] [-o options] [-t
       type.subtype]

       where the suffix is the filesystem type and the -sfnvoN options have the
       same meaning as the normal mount options. The -t option is used for
       filesystems with subtypes support (for example /sbin/mount.fuse -t
       fuse.sshfs).

       The command mount does not pass the mount options unbindable,
       runbindable, private, rprivate, slave, rslave, shared, rshared, auto,
       noauto, comment, x-*, loop, offset and sizelimit to the mount.<suffix>
       helpers. All other options are used in a comma-separated list as an
       argument to the -o option.

ENVIRONMENT
       LIBMOUNT_FORCE_MOUNT2={always|never|auto}
           force to use classic mount(2) system call (requires support for new
           file descriptors based mount API). The default is auto; in this
           case, libmount tries to be smart and use classic mount(2) only for
           well-known issues. If the new mount API is unavailable, libmount can
           still use traditional mount(2), although LIBMOUNT_FORCE_MOUNT2 is
           set to never.

       LIBMOUNT_FSTAB=<path>
           overrides the default location of the fstab file (ignored for suid)

       LIBMOUNT_DEBUG=all
           enables libmount debug output

       LIBBLKID_DEBUG=all
           enables libblkid debug output

       LOOPDEV_DEBUG=all
           enables loop device setup debug output

FILES
       See also "The files /etc/fstab, /etc/mtab and /proc/mounts" section
       above.

       /etc/fstab
           filesystem table

       /run/mount
           libmount private runtime directory

       /etc/mtab
           table of mounted filesystems or symlink to /proc/mounts

       /etc/mtab~
           lock file (unused on systems with mtab symlink)

       /etc/mtab.tmp
           temporary file (unused on systems
Title: Exit Status, External Helpers, Environment Variables, and Files
Summary
This section details the exit status codes for the `mount` command, explaining what each code signifies (success, incorrect invocation, system error, etc.). It then describes the syntax for external mount helpers and lists the mount options not passed to these helpers. Furthermore, the section outlines several environment variables that influence the behavior of the `mount` command, such as `LIBMOUNT_FORCE_MOUNT2`, `LIBMOUNT_FSTAB`, `LIBMOUNT_DEBUG`, and `LIBBLKID_DEBUG`. Finally, it lists and describes key files related to mounting, including `/etc/fstab`, `/run/mount`, and `/etc/mtab`.