Question

I have a variable called $driveusage that contains the following block of text:

Filesystem     Type      Size  Used Avail Use% Mounted on
rootfs         rootfs    111G  8.7G   96G   9% /
/dev/sda1      ext3      111G  8.7G   96G   9% /
devtmpfs       devtmpfs   59M     0   59M   0% /dev
tmpfs          tmpfs      61M     0   61M   0% /dev/shm
tmpfs          tmpfs      61M  264K   60M   1% /run
tmpfs          tmpfs      61M     0   61M   0% /sys/fs/cgroup
tmpfs          tmpfs      61M   16K   61M   1% /tmp

I need to extract data from the rootfs line only, into separate variables (i.e. $drivesize, $driveused, $drivefree, not an array), just the size, used and avail numbers, and just the numbers only (including the decimal).
Keep in mind that the used value, once it goes over 9.9G, will appear as 10G (with no decimal point) and same when avail drops below 10G will appear as 9.9G.

I’ve tried every combination of preg_replace() but I’m just not good with those complex expressions. 🙁

Any help you could provide would be greatly appreciated 🙂

Answer 1

Here’s what I got:

$df_info = explode(' ', shell_exec("df -H / | tail -1 | tr -s ' ' | cut -d ' ' -f 2,3,4"));
$df = array(
    'size'      => $df_info[0],
    'used'      => $df_info[1],
    'available' => $df_info[2],
);

df -H / gets human-readable info about your disk, tail -1 gets the last line of that (the important figures, and tr -s ' ' | cut -d ' ' -f 2,3,4 gets the second, third, and fourth entries (“size”, “used”, and “avail”) in that row.