使用awk命令找出利用率超過20%的非鏡像設備
[root@gateway ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 10G 3.1G 7.0G 31% /
devtmpfs 978M 0 978M 0% /dev
tmpfs 993M 0 993M 0% /dev/shm
tmpfs 993M 9.0M 985M 1% /run
tmpfs 993M 0 993M 0% /sys/fs/cgroup
/dev/sr0 3.8G 3.8G 0 100% /mnt
/dev/mapper/rhel-var 4.9G 406M 4.5G 9% /var
/dev/sda1 497M 140M 357M 29% /boot
tmpfs 199M 0 199M 0% /run/user/0
[root@gateway ~]# df -h|awk -F% '/^\/dev/&&!/\/dev\/sr0/{print$1}'|awk '{if($NF>20)print$1}'
/dev/mapper/rhel-root
/dev/sda1
[root@gateway ~]#