目录

/
/etc
	/ect/profile
	/etc/sysconfig/network-script/if
	/etc/passwd
	/etc/group
	/ect/shadow
/root
/home
/bin
/sbin
/usr

/opt
/tmp
/mnt

常用命令

/etc

cd
	-
	~
	.
	..
	/
ls
touch 
mkdir -p
rmdir
cp -r
mv
rm -rf
vi
vim
	aio
	:set nu 
	:q
	:wq
	:q!
	
	/search
	
	gg
	ndd
	nyy
	p
	u
	shift+zz
	
	
cat
more
less
head
tail

安装jdk
$JAVA_HOME
source /etc/profile

安装mysql
groupadd mysql
useradd -g mysql -s /bin/false mysql

防火墙
systemctl disable/enable/status/start/stop firewalld

安装nginx
sbin/reload

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