Determine what filesystem is mounted where, what is using particular options and how much free space is available.
Display all filesystems.
$ findmnt --all
TARGET SOURCE FSTYPE OPTIONS / /dev/vda1 ext4 rw,relatime,errors=remount-ro,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/freezer cgroup cgroup rw,nosuid,nodev,noexec,relatime,freezer │ │ ├─/sys/fs/cgroup/net_cls,net_prio cgroup cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio │ │ ├─/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/devices cgroup cgroup rw,nosuid,nodev,noexec,relatime,devices │ │ ├─/sys/fs/cgroup/blkio cgroup cgroup rw,nosuid,nodev,noexec,relatime,blkio │ │ ├─/sys/fs/cgroup/perf_event cgroup cgroup rw,nosuid,nodev,noexec,relatime,perf_event │ │ └─/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 ├─/proc proc proc rw,nosuid,nodev,noexec,relatime │ └─/proc/sys/fs/binfmt_misc systemd-1 autofs rw,relatime,fd=35,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=8942 ├─/dev udev devtmpfs rw,nosuid,relatime,size=499100k,nr_inodes=124775,mode=755 │ ├─/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 │ ├─/dev/shm tmpfs tmpfs rw,nosuid,nodev │ ├─/dev/mqueue mqueue mqueue rw,relatime │ └─/dev/hugepages hugetlbfs hugetlbfs rw,relatime └─/run tmpfs tmpfs rw,nosuid,noexec,relatime,size=102040k,mode=755 ├─/run/lock tmpfs tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k └─/run/user/1000 tmpfs tmpfs rw,nosuid,nodev,relatime,size=102036k,mode=700,uid=1000,gid=1000
Display static filesystem information defined in fstab file.
$ cat /etc/fstab
# /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/vda1 during installation UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 / ext4 errors=remount-ro 0 1 # swap was on /dev/vda5 during installation UUID=33d7420a-1ab7-4872-8944-369c37354d1b none swap sw 0 0 /dev/sr0 /media/cdrom0 udf,iso9660 user,noauto 0 0
Display static filesystem information.
$ findmnt --fstab
TARGET SOURCE FSTYPE OPTIONS / UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 ext4 errors=remount-ro none UUID=33d7420a-1ab7-4872-8944-369c37354d1b swap sw /media/cdrom0 /dev/sr0 udf,iso9660 user,noauto
Display static filesystem information for ext4 filesystem type.
$ findmnt --fstab --type ext4
TARGET SOURCE FSTYPE OPTIONS / UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 ext4 errors=remount-ro
Display mounted filesystem information.
$ findmnt --mtab
TARGET SOURCE FSTYPE OPTIONS /sys sysfs sysfs rw,nosuid,nodev,noexec,relatime /proc proc proc rw,nosuid,nodev,noexec,relatime /dev udev devtmpfs rw,nosuid,relatime,size=499100k,nr_inodes=124775,mode=755 /dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 /run tmpfs tmpfs rw,nosuid,noexec,relatime,size=102040k,mode=755 / /dev/vda1 ext4 rw,relatime,errors=remount-ro,data=ordered /sys/kernel/security securityfs securityfs rw,nosuid,nodev,noexec,relatime /dev/shm tmpfs tmpfs rw,nosuid,nodev /run/lock tmpfs tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k /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/pstore pstore pstore rw,nosuid,nodev,noexec,relatime /sys/fs/cgroup/cpu,cpuacct cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct /sys/fs/cgroup/freezer cgroup cgroup rw,nosuid,nodev,noexec,relatime,freezer /sys/fs/cgroup/net_cls,net_prio cgroup cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio /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/devices cgroup cgroup rw,nosuid,nodev,noexec,relatime,devices /sys/fs/cgroup/blkio cgroup cgroup rw,nosuid,nodev,noexec,relatime,blkio /sys/fs/cgroup/perf_event cgroup cgroup rw,nosuid,nodev,noexec,relatime,perf_event /sys/fs/cgroup/pids cgroup cgroup rw,nosuid,nodev,noexec,relatime,pids /proc/sys/fs/binfmt_misc systemd-1 autofs rw,relatime,fd=35,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=8942 /dev/mqueue mqueue mqueue rw,relatime /dev/hugepages hugetlbfs hugetlbfs rw,relatime /sys/kernel/debug debugfs debugfs rw,relatime /run/user/1000 tmpfs tmpfs rw,nosuid,nodev,relatime,size=102036k,mode=700,uid=1000,gid=1000
Display mounted filesystem information for ext4 filesystem type and show available space.
$ findmnt --mtab --type ext4 --df
SOURCE FSTYPE SIZE USED AVAIL USE% TARGET /dev/vda1 ext4 18.6G 936.8M 16.7G 5% /
Display mounted filesystem information for /dev/vda1 device.
$ findmnt --kernel --source /dev/vda1
TARGET SOURCE FSTYPE OPTIONS / /dev/vda1 ext4 rw,relatime,errors=remount-ro,data=ordered
Notice, –kernel options does not need to be specified as it is used by default (proc filesystem).
$ cat /proc/self/mountinfo
16 21 0:16 / /sys rw,nosuid,nodev,noexec,relatime shared:7 - sysfs sysfs rw 17 21 0:4 / /proc rw,nosuid,nodev,noexec,relatime shared:12 - proc proc rw 18 21 0:6 / /dev rw,nosuid,relatime shared:2 - devtmpfs udev rw,size=499100k,nr_inodes=124775,mode=755 19 18 0:17 / /dev/pts rw,nosuid,noexec,relatime shared:3 - devpts devpts rw,gid=5,mode=620,ptmxmode=000 20 21 0:18 / /run rw,nosuid,noexec,relatime shared:5 - tmpfs tmpfs rw,size=102040k,mode=755 21 0 254:1 / / rw,relatime shared:1 - ext4 /dev/vda1 rw,errors=remount-ro,data=ordered 22 16 0:15 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:8 - securityfs securityfs rw 23 18 0:19 / /dev/shm rw,nosuid,nodev shared:4 - tmpfs tmpfs rw 24 20 0:20 / /run/lock rw,nosuid,nodev,noexec,relatime shared:6 - tmpfs tmpfs rw,size=5120k 25 16 0:21 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:9 - tmpfs tmpfs ro,mode=755 26 25 0:22 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:10 - cgroup cgroup rw,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd 27 16 0:23 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:11 - pstore pstore rw 28 25 0:24 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:13 - cgroup cgroup rw,cpu,cpuacct 29 25 0:25 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime shared:14 - cgroup cgroup rw,freezer 30 25 0:26 / /sys/fs/cgroup/net_cls,net_prio rw,nosuid,nodev,noexec,relatime shared:15 - cgroup cgroup rw,net_cls,net_prio 31 25 0:27 / /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,cpuset 32 25 0:28 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:17 - cgroup cgroup rw,memory 33 25 0:29 / /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime shared:18 - cgroup cgroup rw,devices 34 25 0:30 / /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,blkio 35 25 0:31 / /sys/fs/cgroup/perf_event rw,nosuid,nodev,noexec,relatime shared:20 - cgroup cgroup rw,perf_event 36 25 0:32 / /sys/fs/cgroup/pids rw,nosuid,nodev,noexec,relatime shared:21 - cgroup cgroup rw,pids 37 17 0:33 / /proc/sys/fs/binfmt_misc rw,relatime shared:22 - autofs systemd-1 rw,fd=35,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=8942 38 18 0:14 / /dev/mqueue rw,relatime shared:23 - mqueue mqueue rw 39 18 0:34 / /dev/hugepages rw,relatime shared:24 - hugetlbfs hugetlbfs rw 40 16 0:7 / /sys/kernel/debug rw,relatime shared:25 - debugfs debugfs rw 115 20 0:38 / /run/user/1000 rw,nosuid,nodev,relatime shared:71 - tmpfs tmpfs rw,size=102036k,mode=700,uid=1000,gid=1000
Display mounted filesystems information mounted under /dev directory.
$ findmnt --submounts --target /dev
TARGET SOURCE FSTYPE OPTIONS /dev udev devtmpfs rw,nosuid,relatime,size=499100k,nr_inodes=124775,mode=755 ├─/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 ├─/dev/shm tmpfs tmpfs rw,nosuid,nodev ├─/dev/mqueue mqueue mqueue rw,relatime └─/dev/hugepages hugetlbfs hugetlbfs rw,relatime
Display mounted filesystems information using particular options.
$ findmnt --options mode=755,nosuid
TARGET SOURCE FSTYPE OPTIONS /sys/fs/cgroup tmpfs tmpfs ro,nosuid,nodev,noexec,mode=755 /dev udev devtmpfs rw,nosuid,relatime,size=499100k,nr_inodes=124775,mode=755 /run tmpfs tmpfs rw,nosuid,noexec,relatime,size=102040k,mode=755
Display mounted filesystem information for ext4 and tmpfs filesystems type and display using JSON format.
$ findmnt --types ext4,tmpfs --json
{
"filesystems": [
{"target": "/", "source": "/dev/vda1", "fstype": "ext4", "options": "rw,relatime,errors=remount-ro,data=ordered",
"children": [
{"target": "/sys/fs/cgroup", "source": "tmpfs", "fstype": "tmpfs", "options": "ro,nosuid,nodev,noexec,mode=755"},
{"target": "/dev/shm", "source": "tmpfs", "fstype": "tmpfs", "options": "rw,nosuid,nodev"},
{"target": "/run", "source": "tmpfs", "fstype": "tmpfs", "options": "rw,nosuid,noexec,relatime,size=102040k,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=102036k,mode=700,uid=1000,gid=1000"}
]
}
]
}
]
}
Display mounted filesystem information for tmpfs filesystems type and display available space using key=”value” format, which is very useful for shell scripting .
$ findmnt --type tmpfs --pairs --df
SOURCE="tmpfs" FSTYPE="tmpfs" SIZE="99.7M" USED="3M" AVAIL="96.7M" USE%="3%" TARGET="/run" SOURCE="tmpfs" FSTYPE="tmpfs" SIZE="498.2M" USED="0" AVAIL="498.2M" USE%="0%" TARGET="/dev/shm" SOURCE="tmpfs" FSTYPE="tmpfs" SIZE="5M" USED="0" AVAIL="5M" USE%="0%" TARGET="/run/lock" SOURCE="tmpfs" FSTYPE="tmpfs" SIZE="498.2M" USED="0" AVAIL="498.2M" USE%="0%" TARGET="/sys/fs/cgroup" SOURCE="tmpfs" FSTYPE="tmpfs" SIZE="99.7M" USED="0" AVAIL="99.7M" USE%="0%" TARGET="/run/user/1000"
Display static filesystem information, evaluate it and display using raw format without headings.
$ findmnt --fstab --evaluate --raw --noheadings
/ /dev/vda1 ext4 errors=remount-ro none /dev/vda5 swap sw /media/cdrom0 /dev/sr0 udf,iso9660 user,noauto