使用awk命令选择文本

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

输出是：

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

所需输出= 27G

Answer 1

你需要转义$2以便在ssh连接中由awk解释它：

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

另外，请注意，您可以使用grep内的awk条件轻轻挤压它：

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