1、实验-查询系统状态

uname
uname -a
uname -r
cat /proc/cpuinfo
cat /proc/meminfo
hostname
last
lastlog
free
top
pstree
ps aux

2、实验-top

dd if=/dev/zero of=/dev/null bs=1M count=100000
top

3、实验-kill

kill -l
ping 192.168.200.2
ps aux | grep ping
kill -19 2992
ps aux | grep ping
kill -18 2992
ps aux | grep ping

4、实验-前台和后台

echo uos > uos
echo tx > tx
vim uos
ctrl+z
vim bing &
jobs
fg 1
kill -9 %2

实验-区别

ctrl+z
ctrl+d
ctrl+c