使用awk命令選擇文本

Question

USERNAME=root
HOSTS="192.168.122.91 192.168.122.102 192.168.122.180"

SCRIPT="df -h /dev/vda3 | grep '/export/brick' | awk '{print $2}' ";
for HOSTNAME in ${HOSTS} ; do
   (ssh -l ${USERNAME} ${HOSTNAME} "${SCRIPT}")
done

輸出是：

/dev/vda3              27G  722M   26G   3% /export/brick

期望輸出= 27G

Answer 1

您需要轉義$2以使其在ssh連接中由awk解釋：

SCRIPT="df -h /dev/vda3 | grep '/export/brick' | awk '{print \$2}' ";

另外，請注意你可以使用awk的grep條件稍微擠一下：

SCRIPT="df -h /dev/vda3 | awk '/export\/brick/{print \$2}' ";