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

OUTPUT IS:

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

desired output = 27G

Answer 1

You need to escape the $2 to have it interpreted by awk inside the ssh connection:

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

Also, note you can squeeze it a little bit, using the grep condition inside the awk :

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