mount

オプション

-w

(default) writable

-r

read only

-a

Mount all filesystems mentioned in /etc/fstab

$ mount
/dev/mmcblk0p2 on / type ext4 (rw,noatime,data=ordered)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
.... (省略）....