Linux 习题练习-01（文件操作命令、压缩命令、软件安装）

	[root@localhost ~]# mkdir -p Video/Watched

	[root@localhost ~]# echo "A" > a.txt && echo "B" > b.txt && echo "C" > c.txt

	[root@localhost ~]# cat a.txt b.txt c.txt > /tmp/bound.txt

	[root@localhost ~]# tail -n 100 /var/log/dmesg > ./dmesg.log.bak

	[root@localhost ~]# wc -l dmesg.log.bak 

	100 dmesg.log.bak

	[root@localhost ~]# ls -a >> dir.txt

	[root@localhost ~]# cat dir.txt 

	[root@localhost rhel7]# mkdir /tmp/rhel7

	[root@localhost rhel7]# tar -czvf /tmp/rhel7/student.tar.gz /home

	[root@localhost ~]# mkdir /root/finder

	[root@localhost ~]# find / -user ruochen -type f -exec cp {} /root/finder/ \; 2> /dev/null

	[root@localhost ~]# grep 'boot' /root/initial-setup-ks.cfg | grep -v '^$' > /root/lines

			[root@localhost yum.repos.d]# yum install system-config-users

2. 将 rhel7 中python 环境升级到 python3 （python2 ----> python3）
	1. 准备必要的安装文件包括库文件
	

			[root@localhost ~]# yum install zlib-devel openssl-devel -y

			[root@localhost ~]# yum groups install development -y

	2. 进入源码包编译环境
		

			[root@localhost Python-3.6.4]# ./configure prefix=/usr/local/python3

	3. 编译安装

			[root@localhost Python-3.6.4]# make && make install 

	4. 添加bin 目录到环境变量

			[root@localhost bin]# echo 'export PATH="$PATH:/usr/local/python3/bin"' >> /etc/profile

			[root@localhost ~]# source /etc/profile

	5. 升级 pip

			[root@localhost ~]# pip3 install --upgrade pip

[root@localhost ~]# echo "A" > a.txt && echo "B" > b.txt && echo "C" > c.txt
[root@localhost ~]# cat a
anaconda-ks.cfg  a.txt            
[root@localhost ~]# cat a.txt 
A
[root@localhost ~]# cat b.txt 
B
[root@localhost ~]# cat c.txt 
C
[root@localhost ~]#