使用PHP从df -h --total捕获特定值

Question

How can i populate a variable holding the total value from below content extracted after running df -h --total on centos. Note: the result is not from command line but from a php file.

How do i only capture the percentage value in the last line using PHP?

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 20G 685M 20G 4% /
devtmpfs 40G 0 40G 0% /dev
tmpfs 40G 0 40G 0% /dev/shm
tmpfs 40G 177M 40G 1% /run
tmpfs 40G 0 40G 0% /sys/fs/cg
/dev/mapper/rhel-usr 20G 3.2G 17G 16% /usr
/dev/sda2 1014M 223M 792M 22% /boot
/dev/mapper/rhel-opt_mycom 100G 37G 63G 37% /opt/my
/dev/mapper/oradb-nimsdb 2.0T 1.5T 614G 71% /opt/my/data
/dev/mapper/redo-logs 305G 72G 234G 24% /opt/my/data/
/dev/mapper/rhel-home 20G 472M 20G 3% /home
/dev/mapper/rhel-var 20G 1.4G 19G 7% /var
tmpfs 7.9G 0 7.9G 0% /run/user/1000
total 3.6T 2.3T 1.4T 63% -

I.E. i would want a variable that has the value 63%

$variable = 63%

Answer 1

You can add grep and awk to extract the info you want:

$result = $ssh->exec("df -h --total | grep '^total ' | awk '{print $5}'");

Note that you need to change the types of quoting you are doing for this to work properly. Just copy and paste the above and you should be good.