环境： Centos 7
1、新建账号：
[root@localhost ~]# sudo adduser pengfeima
2、为新账号初始化密码：
[root@localhost ~]# passwd pengfeima
Changing password for user pengfeima.
New password:
BAD PASSWORD: The password fails the dictionary check - it does not contain enough DIFFERENT characters
Retype new password:
passwd: all authentication tokens updated successfully.
3、为该账号添加切换root权限的指令:
使用命令“visodu”
在代码片段中找到“centos ALL=(ALL) NOPASSWD: ALL”
修改为centos,pengfeima ALL=(ALL) NOPASSWD: ALL或者添加该行.
4、采用reboot 命令重启centos7服务
扫描二维码关注公众号，回复：
3744198 查看本文章
5、添加用户到root 分组 ：gpasswd -a shunhe root
6、tar 压缩与解压
01-.tar格式
解包：[＊＊＊＊＊＊＊]$ tar xvf FileName.tar
打包：[＊＊＊＊＊＊＊]$ tar cvf FileName.tar DirName（注：tar是打包，不是压缩！）
02-.gz格式
解压1：[＊＊＊＊＊＊＊]$ gunzip FileName.gz
解压2：[＊＊＊＊＊＊＊]$ gzip -d FileName.gz
压 缩：[＊＊＊＊＊＊＊]$ gzip FileName
03-.tar.gz格式
解压：[＊＊＊＊＊＊＊]$ tar zxvf FileName.tar.gz
压缩：[＊＊＊＊＊＊＊]$ tar zcvf FileName.tar.gz DirName
04-.bz2格式
解压1：[＊＊＊＊＊＊＊]$ bzip2 -d FileName.bz2
解压2：[＊＊＊＊＊＊＊]$ bunzip2 FileName.bz2
压 缩： [＊＊＊＊＊＊＊]$ bzip2 -z FileName
05-.tar.bz2格式
解压：[＊＊＊＊＊＊＊]$ tar jxvf FileName.tar.bz2
压缩：[＊＊＊＊＊＊＊]$ tar jcvf FileName.tar.bz2 DirName
06-.bz格式
解压1：[＊＊＊＊＊＊＊]$ bzip2 -d FileName.bz
解压2：[＊＊＊＊＊＊＊]$ bunzip2 FileName.bz
07-.tar.bz格式
解压：[＊＊＊＊＊＊＊]$ tar jxvf FileName.tar.bz
08-.Z格式
解压：[＊＊＊＊＊＊＊]$ uncompress FileName.Z
压缩：[＊＊＊＊＊＊＊]$ compress FileName
09-.tar.Z格式
解压：[＊＊＊＊＊＊＊]$ tar Zxvf FileName.tar.Z
压缩：[＊＊＊＊＊＊＊]$ tar Zcvf FileName.tar.Z DirName
10-.tgz格式
解压：[＊＊＊＊＊＊＊]$ tar zxvf FileName.tgz
11-.tar.tgz格式
解压：[＊＊＊＊＊＊＊]$ tar zxvf FileName.tar.tgz
压缩：[＊＊＊＊＊＊＊]$ tar zcvf FileName.tar.tgz FileName
12-.zip格式
解压：[＊＊＊＊＊＊＊]$ unzip FileName.zip
压缩：[＊＊＊＊＊＊＊]$ zip FileName.zip DirName
13-.lha格式
解压：[＊＊＊＊＊＊＊]$ lha -e FileName.lha
压缩：[＊＊＊＊＊＊＊]$ lha -a FileName.lha FileName
14-.rar格式
解压：[＊＊＊＊＊＊＊]$ rar a FileName.rar
压缩：[＊＊＊＊＊＊＊]$ rar e FileName.rar
rar请到：下载！
解压后请将rar_static拷贝到/usr/bin目录（其他由$PATH环境变量
指定的目录也行）：[＊＊＊＊＊＊＊]$ cp rar_static /usr/bin/rar