Linux 4.4.0-75-generic＃96-Ubuntu SMP Thu Apr 20 09:56:33 UTC 2017 x86_64 x86_64 x86_64 GNU / Linux
权限似乎很大
>>> ll / ... drwxrwxrwt 8 root root 4096 May 1 02:44 tmp/ 拒绝访问：
sudo -u www-data echo "hello" > /tmp/test.txt -bash: /tmp/test.txt: Permission denied
磁盘空间似乎确定：
>>> df -h Filesystem Size Used Avail Use% Mounted on udev 980M 0 980M 0% /dev tmpfs 200M 8.2M 192M 5% /run /dev/xvda1 7.8G 6.3G 1.1G 86% / tmpfs 1000M 0 1000M 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 1000M 0 1000M 0% /sys/fs/cgroup cgmfs 100K 0 100K 0% /run/cgmanager/fs tmpfs 200M 0 200M 0% /run/user/1000