grep or 条件
[aa@localhost ~]$ df -hT |grep 'sda1/|sda3'
/dev/sda3 ext3 225G 162G 52G 76% /
/dev/sda1 ext3 122M 12M 104M 11% /boot
[aa@localhost ~]$ df -hT |grep -e "sda1" -e "sda3"
/dev/sda3 ext3 225G 162G 52G 76% /
/dev/sda1 ext3 122M 12M 104M 11% /boot
grep -E 'sda1|sda3'
egrep 'sda1|sda3'