rhcsa——第二天

1.手动调整当前主机时间（时区和时间更改）

[[email protected] ~]# date 050510102000.10
Fri May  5 10:10:10 CST 2000
[[email protected] ~]# timedatectl set-timezone Asia/Shanghai

2.查看系统时间按照‘年/月/日 时:分:秒’格式显示并将结果写入time文件

[[email protected] ~]# touch time
[[email protected] ~]# ll
total 16
lrwxrwxrwx. 1 root root   15 Jul 30 11:49 aaa.ink -> anaconda-ks.cfg
-rw-------. 1 root root 1205 Jul 27 11:44 anaconda-ks.cfg
drwxr-xr-x. 2 root root    6 Jul 27 13:55 Desktop
drwxr-xr-x. 2 root root    6 Jul 27 13:55 Documents
drwxr-xr-x. 2 root root    6 Jul 27 13:55 Downloads
-rw-r--r--. 4 root root   29 Aug  1 21:36 file
lrwxrwxrwx. 1 root root    4 Jul 30 11:44 file.lnk -> file
-rw-r--r--. 1 root root 1477 Jul 27 13:54 initial-setup-ks.cfg
drwxr-xr-x. 2 root root    6 Jul 27 13:55 Music
-rw-r--r--. 4 root root   29 Aug  1 21:36 newfile
drwxr-xr-x. 2 root root    6 Jul 27 13:55 Pictures
drwxr-xr-x. 2 root root    6 Jul 27 13:55 Public
drwxr-xr-x. 2 root root    6 Jul 27 13:55 Templates
drwxr-xr-x. 2 root root    6 Jul 30 14:13 test
-rw-r--r--. 1 root root    0 Aug  1 21:37 time
drwxr-xr-x. 2 root root    6 Jul 27 13:55 Videos
[[email protected] ~]# date -s "2022-8-01 21:37:30"
[[email protected] ~]# date > time
[[email protected] ~]# cat time
Mon Aug  1 21:37:49 CST 2022

3.查看主机/etc/下的group文件，是什么类型文件

[[email protected] ~]# ll -d /etc/sysconfig
drwxr-xr-x. 5 root root 4096 Jul 27  2022 /etc/sysconfig

4.查看/etc/sysconfig目录文件的属性

[[email protected] ~]# touch /etc/group
[[email protected] ~]# 
[[email protected] ~]# ll -d /etc/group
-rw-r--r--. 1 root root 981 Jul 27  2022 /etc/group

5.在root用户的家目录下创建file文件，在/pub创建该文件的软链接文件newfile，在/test创建硬链接文件file.lnk

软链接：

[[email protected] ~]# touch /root/file
[[email protected] ~]# ln -s /root/file /pub/newfile
[[email protected] ~]# ll /pub
lrwxrwxrwx. 1 root root 10 May  5 11:21 newfile -> /root/file

 硬链接：

[[email protected] ~]# ln /root/file /test/file.ink
[[email protected] ~]# ll -i
35309880 -rw-r--r--. 4 root root   29 May  5 11:20 file
[[email protected] ~]# ll -i /test
35309880 -rw-r--r--. 4 root root 29 May  5 11:20 file.ink

6.在文件中编辑一下内容：

Good good study,day day up

[[email protected] ~]# nano /root/file
[[email protected] ~]# cat /root//file
Good good study,day day up