linux学习--基础shell练习

Posted 2021-12-05 落阳٩

练习

1、统计出/etc/passwd文件中其默认shell为非/sbin/nologin的用户个数，并将用户都显示出来

[root@localhost date]# grep -vE /sbin/nologin$ /etc/passwd | cut -d: -f1

2、查出用户UID最大值的用户名、UID及shell类型

[root@localhost date]# sort -t : -k 3 -nr /etc/passwd | head -1|cut -d : -f 1,3,7

3、统计当前连接本机的每个远程主机IP的连接数，并按从大到小排序

[root@localhost date]# netstat -t | grep ssh\\>|tr -s ":" " " |cut -d " " -f6 |uniq -c |sort -nr

4、编写脚本disk.sh，显示当前硬盘分区中空间利用率最大的值

[root@localhost date]# ./disk.sh 
17%
[root@localhost date]# cat disk.sh 
#!/bin/bash
echo `df | grep -E /dev/sd|tr -s " " |cut -d " " -f5|sort -nr | head -1`

5、编写脚本 systeminfo.sh，显示当前主机系统信息，包括:主机名，IPv4地址，操作系统版本，内核版本，CPU型号，内存大小，硬盘大小

[root@localhost date]# ./systeminfo.sh 
-------------------------SYSTEMINFO----------------------
hostname is  localhost.localdomain
ip add is    192.168.1.44
os is       CentOS Linux release 8.4.2105
kernel       4.18.0-305.3.1.el8.x86_64
cpu          Intel(R) Core(TM) i5-10210U CPU @ 1.60GHz
memory       1.7Gi
diskinfo     200G
---------------------------------------------------------
[root@localhost date]# cat systeminfo.sh 
#!/bin/bash
green="\\E[1;32m"
red="echo -e \\E[1;31m"
end="\\E[0m"
$red-------------------------SYSTEMINFO----------------------$end
echo -e "hostname is    $green `hostname`$end"
echo -e "ip add is  $green `ifconfig eth0 |sed -nr 2s#.*inet (([0-9]+\\.){3}[0-9]+).*#\\1#p`$end"
echo -e "os is  $green `lsb_release -a |grep "Description"|cut -d : -f2`$end"
echo -e "kernel     $green `uname -r`$end"
echo -e "cpu           $green `lscpu |grep Model name| tr -s " "| cut -d : -f2 |head -1`$end"
echo -e "memory     $green `free -h | grep Mem|tr -s ":" " " | cut -d " " -f2`$end"
echo -e "diskinfo   $green `lsblk | grep disk|tr -s " "|cut -d " " -f 4`$end"
$red---------------------------------------------------------$end
[root@localhost date]#