Linux 下有用的top monitoring tool：

top - original tool
htop - adds support to multicore/cpu
iotop - input/output monitoring
iftop - network monitoring
atop - merges previous elements into a single overview
gtop - fancy visuals of system stats
slabtop – displays a listing of the top caches

Linux 下给指定用户读写执行权利： sudo setfacl -m u:lekai:rwx -R /usr/local