df -h 命令输出为：
bhaveshk@linux:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 7.7G 0 7.7G 0% /dev
tmpfs 1.6G 2.3M 1.6G 1% /run
/dev/sda6 19G 4.3G 14G 25% /
/dev/sda11 46G 12G 32G 28% /usr
tmpfs 7.7G 0 7.7G 0% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 7.7G 0 7.7G 0% /sys/fs/cgroup
/dev/sda7 4.6G 229M 4.1G 6% /boot
/dev/sda9 46G 17G 27G 40% /var
/dev/loop0 128K 128K 0 100% /snap/bare/5
/dev/loop1 64M 64M 0 100% /snap/core20/1974
/dev/loop2 119M 119M 0 100% /snap/core/15511
/dev/loop4 74M 74M 0 100% /snap/core22/817
/dev/loop7 219M 219M 0 100% /snap/gnome-3-34-1804/93
/dev/loop3 56M 56M 0 100% /snap/core18/2785
/dev/loop12 38M 38M 0 100% /snap/hunspell-dictionaries-1-7-2004/2
/dev/loop19 54M 54M 0 100% /snap/snapd/19457
/dev/loop15 321M 321M 0 100% /snap/vlc/3078
/dev/loop18 13M 13M 0 100% /snap/snap-store/959
/dev/loop8 350M 350M 0 100% /snap/gnome-3-38-2004/143
/dev/loop11 176M 176M 0 100% /snap/mysql-workbench-community/12
/dev/loop16 348M 348M 0 100% /snap/wine-platform-runtime/349
/dev/loop5 246M 246M 0 100% /snap/firefox/2908
/dev/loop9 37M 37M 0 100% /snap/heroku/4092
/dev/loop17 304M 304M 0 100% /snap/wine-platform-5-stable/18
/dev/loop20 323M 323M 0 100% /snap/wine-platform-6-stable/19
/dev/loop13 92M 92M 0 100% /snap/gtk-common-themes/1535
/dev/loop10 486M 486M 0 100% /snap/gnome-42-2204/120
/dev/loop14 117M 117M 0 100% /snap/robo3t-snap/9
/dev/loop6 165M 165M 0 100% /snap/gnome-3-28-1804/198
/dev/sda10 46G 281M 43G 1% /opt
/dev/sda14 153G 97G 48G 67% /home
/dev/sda12 46G 9.7M 44G 1% /tmp
/dev/sda15 274G 28K 260G 1% /data
/dev/sda1 146M 89M 58M 61% /boot/efi
tmpfs 1.6G 72K 1.6G 1% /run/user/1000
从评论移出：
bhaveshk@linux:~$ free -h
total used free shared buff/cache available
Mem: 15Gi 12Gi 415Mi 1.2Gi 2.4Gi 1.4Gi
Swap: 2.0Gi 0B 2.0Gi
==> 我刚刚创建了 2GB 的交换空间。