Linux习题练习-03（users & group、tar、gzip、yum源配置）

	[root@localhost home]# mkdir /home/tomcat

	[root@localhost ~]# useradd tom

	[root@localhost ~]# id tom

	uid=1001(tom) gid=1001(tom) groups=1001(tom)

	[root@localhost ~]# usermod -g mail -d /home/tomcat -u 1111 tom

	[root@localhost ~]# id tom

	uid=1111(tom) gid=12(mail) groups=12(mail)

	[root@localhost tomcat]# echo '123456' | passwd --stdin tom

	Changing password for user tom.

	passwd: all authentication tokens updated successfully.

	[root@localhost tomcat]# useradd -c administrator -d /home/admin -e 2022-12-24 -g root -G bin,adm,mail admin

	[root@localhost tomcat]# id admin

	uid=1112(admin) gid=0(root) groups=0(root),1(bin),4(adm),12(mail)

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

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

```

gzip 与 bzip2 压缩与解压缩(-d) 

这两个指令压缩文件，不能压缩目录

```

	[root@localhost rhel7]# touch aa.txt

	[root@localhost rhel7]# gzip aa.txt 

	[root@localhost rhel7]# ls

	aa.txt.gz  student.tar

	[root@localhost rhel7]# gzip -d aa.txt.gz 

	[root@localhost rhel7]# ls

	aa.txt  student.tar

	[root@localhost rhel7]# bzip2 aa.txt 

	[root@localhost rhel7]# ls

	aa.txt.bz2  home  student.tar.gz

	[root@localhost rhel7]# tar -xjvf aa.txt.bz2 

	[root@localhost rhel7]# ls

	aa.txt.bz2  home  student.tar.gz

	[root@localhost rhel7]# bzip2 -d aa.txt.bz2 

	[root@localhost rhel7]# ls

	aa.txt  home  student.tar.gz

	[root@localhost ~]# tail -c 2K /root/initial-setup-ks.cfg 

	[root@localhost ~]# mkdir -p /share/{teach,office,finance,admin,market}

	[root@localhost ~]# cd /share/

	[root@localhost share]# ls

	admin  finance  market  office  teach

	[root@localhost share]# mkdir /mnt/cdrom

	[root@localhost share]# mount /dev/cdrom /mnt/cdrom/

	[root@localhost share]# cd /etc/yum.repos.d/

	[root@localhost yum.repos.d]# vim dvd.repo 

	[dvd]

	name = dvd

	baseurl = file:///mnt/cdrom

	gpgcheck = 0

	enabled = 1

	[root@localhost yum.repos.d]# yum clean all

	[root@localhost yum.repos.d]# yum repolist all