findmnt
"findmnt will list all mounted filesystems or search for a filesystem. The findmnt command is able to search in /etc/fstab, /etc/fstab.d, /etc/mtab or /proc/self/mountinfo. If device or mountpoint is not given, all filesystems are shown." - man findmnt
Examples
Simple usage
Here is the output of findmnt on an Ubuntu 16.04 Vagrant box:
TARGET SOURCE FSTYPE OPTIONS
/ /dev/sda1 ext4 rw,relatime,data=ordered
├─/sys sysfs sysfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/security securityfs securityfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup tmpfs tmpfs ro,nosuid,nodev,noexec,mode=755
│ │ ├─/sys/fs/cgroup/systemd cgroup cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd
│ │ ├─/sys/fs/cgroup/cpu,cpuacct cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
│ │ ├─/sys/fs/cgroup/perf_event cgroup cgroup rw,nosuid,nodev,noexec,relatime,perf_event
│ │ ├─/sys/fs/cgroup/hugetlb cgroup cgroup rw,nosuid,nodev,noexec,relatime,hugetlb
│ │ ├─/sys/fs/cgroup/blkio cgroup cgroup rw,nosuid,nodev,noexec,relatime,blkio
│ │ ├─/sys/fs/cgroup/devices cgroup cgroup rw,nosuid,nodev,noexec,relatime,devices
│ │ ├─/sys/fs/cgroup/cpuset cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpuset
│ │ ├─/sys/fs/cgroup/memory cgroup cgroup rw,nosuid,nodev,noexec,relatime,memory
│ │ ├─/sys/fs/cgroup/net_cls,net_prio cgroup cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
│ │ ├─/sys/fs/cgroup/freezer cgroup cgroup rw,nosuid,nodev,noexec,relatime,freezer
│ │ └─/sys/fs/cgroup/pids cgroup cgroup rw,nosuid,nodev,noexec,relatime,pids
│ ├─/sys/fs/pstore pstore pstore rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/debug debugfs debugfs rw,relatime
│ └─/sys/fs/fuse/connections fusectl fusectl rw,relatime
├─/proc proc proc rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc systemd-1 autofs rw,relatime,fd=33,pgrp=1,timeout=0,minproto=5,maxproto=5,direct
├─/dev udev devtmpfs rw,nosuid,relatime,size=500888k,nr_inodes=125222,mode=755
│ ├─/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
│ ├─/dev/shm tmpfs tmpfs rw,nosuid,nodev
│ ├─/dev/hugepages hugetlbfs hugetlbfs rw,relatime
│ └─/dev/mqueue mqueue mqueue rw,relatime
├─/run tmpfs tmpfs rw,nosuid,noexec,relatime,size=101596k,mode=755
│ ├─/run/lock tmpfs tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k
│ └─/run/user/1000 tmpfs tmpfs rw,nosuid,nodev,relatime,size=101596k,mode=700,uid=1000,gid=1000
├─/var/lib/lxcfs lxcfs fuse.lxcfs rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other
└─/vagrant vagrant vboxsf rw,nodev,relatime
Output as key/value pairs per device
$ findmnt -P
TARGET="/sys" SOURCE="sysfs" FSTYPE="sysfs" OPTIONS="rw,nosuid,nodev,noexec,relatime"
TARGET="/proc" SOURCE="proc" FSTYPE="proc" OPTIONS="rw,nosuid,nodev,noexec,relatime"
TARGET="/dev" SOURCE="udev" FSTYPE="devtmpfs" OPTIONS="rw,nosuid,relatime,size=500888k,nr_inodes=125222,mode=755"
TARGET="/dev/pts" SOURCE="devpts" FSTYPE="devpts" OPTIONS="rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000"
TARGET="/run" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,nosuid,noexec,relatime,size=101596k,mode=755"
TARGET="/" SOURCE="/dev/sda1" FSTYPE="ext4" OPTIONS="rw,relatime,data=ordered"
TARGET="/sys/kernel/security" SOURCE="securityfs" FSTYPE="securityfs" OPTIONS="rw,nosuid,nodev,noexec,relatime"
TARGET="/dev/shm" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,nosuid,nodev"
TARGET="/run/lock" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,nosuid,nodev,noexec,relatime,size=5120k"
TARGET="/sys/fs/cgroup" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="ro,nosuid,nodev,noexec,mode=755"
TARGET="/sys/fs/cgroup/systemd" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd"
TARGET="/sys/fs/pstore" SOURCE="pstore" FSTYPE="pstore" OPTIONS="rw,nosuid,nodev,noexec,relatime"
TARGET="/sys/fs/cgroup/net_cls,net_prio" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,net_cls,net_prio"
TARGET="/sys/fs/cgroup/perf_event" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,perf_event"
TARGET="/sys/fs/cgroup/cpu,cpuacct" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,cpu,cpuacct"
TARGET="/sys/fs/cgroup/hugetlb" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,hugetlb"
TARGET="/sys/fs/cgroup/memory" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,memory"
TARGET="/sys/fs/cgroup/devices" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,devices"
TARGET="/sys/fs/cgroup/freezer" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,freezer"
TARGET="/sys/fs/cgroup/cpuset" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,cpuset"
TARGET="/sys/fs/cgroup/blkio" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,blkio"
TARGET="/sys/fs/cgroup/pids" SOURCE="cgroup" FSTYPE="cgroup" OPTIONS="rw,nosuid,nodev,noexec,relatime,pids"
TARGET="/proc/sys/fs/binfmt_misc" SOURCE="systemd-1" FSTYPE="autofs" OPTIONS="rw,relatime,fd=26,pgrp=1,timeout=0,minproto=5,maxproto=5,direct"
TARGET="/sys/kernel/debug" SOURCE="debugfs" FSTYPE="debugfs" OPTIONS="rw,relatime"
TARGET="/dev/hugepages" SOURCE="hugetlbfs" FSTYPE="hugetlbfs" OPTIONS="rw,relatime"
TARGET="/dev/mqueue" SOURCE="mqueue" FSTYPE="mqueue" OPTIONS="rw,relatime"
TARGET="/sys/fs/fuse/connections" SOURCE="fusectl" FSTYPE="fusectl" OPTIONS="rw,relatime"
TARGET="/var/lib/lxcfs" SOURCE="lxcfs" FSTYPE="fuse.lxcfs" OPTIONS="rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other"
TARGET="/vagrant" SOURCE="vagrant" FSTYPE="vboxsf" OPTIONS="rw,nodev,relatime"
TARGET="/run/user/1000" SOURCE="tmpfs" FSTYPE="tmpfs" OPTIONS="rw,nosuid,nodev,relatime,size=101596k,mode=700,uid=1000,gid=1000"
Output as JSON
$ findmnt -J
{
"filesystems": [
{"target": "/", "source": "/dev/sda1", "fstype": "ext4", "options": "rw,relatime,data=ordered",
"children": [
{"target": "/sys", "source": "sysfs", "fstype": "sysfs", "options": "rw,nosuid,nodev,noexec,relatime",
"children": [
{"target": "/sys/kernel/security", "source": "securityfs", "fstype": "securityfs", "options": "rw,nosuid,nodev,noexec,relatime"},
{"target": "/sys/fs/cgroup", "source": "tmpfs", "fstype": "tmpfs", "options": "ro,nosuid,nodev,noexec,mode=755",
"children": [
{"target": "/sys/fs/cgroup/systemd", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd"},
{"target": "/sys/fs/cgroup/net_cls,net_prio", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,net_cls,net_prio"},
{"target": "/sys/fs/cgroup/perf_event", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,perf_event"},
{"target": "/sys/fs/cgroup/cpu,cpuacct", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,cpu,cpuacct"},
{"target": "/sys/fs/cgroup/hugetlb", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,hugetlb"},
{"target": "/sys/fs/cgroup/memory", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,memory"},
{"target": "/sys/fs/cgroup/devices", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,devices"},
{"target": "/sys/fs/cgroup/freezer", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,freezer"},
{"target": "/sys/fs/cgroup/cpuset", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,cpuset"},
{"target": "/sys/fs/cgroup/blkio", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,blkio"},
{"target": "/sys/fs/cgroup/pids", "source": "cgroup", "fstype": "cgroup", "options": "rw,nosuid,nodev,noexec,relatime,pids"}
]
},
{"target": "/sys/fs/pstore", "source": "pstore", "fstype": "pstore", "options": "rw,nosuid,nodev,noexec,relatime"},
{"target": "/sys/kernel/debug", "source": "debugfs", "fstype": "debugfs", "options": "rw,relatime"},
{"target": "/sys/fs/fuse/connections", "source": "fusectl", "fstype": "fusectl", "options": "rw,relatime"}
]
},
{"target": "/proc", "source": "proc", "fstype": "proc", "options": "rw,nosuid,nodev,noexec,relatime",
"children": [
{"target": "/proc/sys/fs/binfmt_misc", "source": "systemd-1", "fstype": "autofs", "options": "rw,relatime,fd=26,pgrp=1,timeout=0,minproto=5,maxproto=5,direct"}
]
},
{"target": "/dev", "source": "udev", "fstype": "devtmpfs", "options": "rw,nosuid,relatime,size=500888k,nr_inodes=125222,mode=755",
"children": [
{"target": "/dev/pts", "source": "devpts", "fstype": "devpts", "options": "rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000"},
{"target": "/dev/shm", "source": "tmpfs", "fstype": "tmpfs", "options": "rw,nosuid,nodev"},
{"target": "/dev/hugepages", "source": "hugetlbfs", "fstype": "hugetlbfs", "options": "rw,relatime"},
{"target": "/dev/mqueue", "source": "mqueue", "fstype": "mqueue", "options": "rw,relatime"}
]
},
{"target": "/run", "source": "tmpfs", "fstype": "tmpfs", "options": "rw,nosuid,noexec,relatime,size=101596k,mode=755",
"children": [
{"target": "/run/lock", "source": "tmpfs", "fstype": "tmpfs", "options": "rw,nosuid,nodev,noexec,relatime,size=5120k"},
{"target": "/run/user/1000", "source": "tmpfs", "fstype": "tmpfs", "options": "rw,nosuid,nodev,relatime,size=101596k,mode=700,uid=1000,gid=1000"}
]
},
{"target": "/var/lib/lxcfs", "source": "lxcfs", "fstype": "fuse.lxcfs", "options": "rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other"},
{"target": "/vagrant", "source": "vagrant", "fstype": "vboxsf", "options": "rw,nodev,relatime"},
]
}
]
}