1、用shell脚本批量建立Linux用户
实现要求：创建用户student1到student50,指定组为student组！而且每个用户需要设定一个不同的密码！
#!/bin/bash for i in `seq 1 10` do useradd -G student student$i; echo student$i | passwd student$i --stdin; done
注意： `seq 1 10`不是‘’哦
实现要求：创建用户，设置相同密码
#!/bin/bash password="123456" for USER in user1 user2 user3 do useradd -m $USER echo -e "${password}\n${password}" | passwd $USER done
【说明： echo -n 不换行输出： $echo -n "123" $echo "456" 最终输出 123456 而不是 123 456 echo -e 处理特殊字符： \n 换行且光标移至行首 】
2、批量创建用户（用户交互版）
#!/bin/bash ################################# #user_add #v1.0 huangjiaping 2020-06-11 ################################ read -p "please input username password number of user: " username pass num echo " #===================================# #have add user #username:$username #password:$pass #number:$num #===================================# " read -p "Are you sure[y/n]: " action if [ "$action" = "y" ];then for i in `seq 1 $num`#注意：seq支持参数，而{1..$num}这种是错误，{}不支持参数的。 do { user=$username$i useradd $user echo $password|passwd $user --stdin &>/dev/null echo "$user is created" }& done wait echo "finish..." else echo "退出" exit fi
实现效果：
3、实现批量创建用户（文件版）
#!/bin/bash if [ $# -eq 0 ];then #判断是否有参数 echo "usage:`basename $0` file" exit 1 fi if [ ! -f $1 ];then #判断参数是否是文件 echo "error file" exit 2 fi i=/root/user_file.txt
#for处理文件默认是按回车分隔，而不会以空格或tab键
#所以要重新定义分隔符
#IFS内部字段分隔符
#IFS=$'\n'
IFS=$'\n'
for line in `cat $i` do if [ ${#line} -eq 0 ];then #跳过用户文件内容中的空行 continue fi user=`echo $line|awk '{print $1}'` pass=`echo $line|awk '{print $2}'` id $user &>/dev/null if [ $? -eq 0 ];then echo "user $user already exists" else useradd $user echo $pass | passwd $user --stdin echo "$user is created" fi done
用户文件：user_file.txt
[root@localhost ~]# cat user_file.txt #这里是空格，注意要跳过 pp 123
实现效果：
[root@localhost ~]# bash -xv file_user_add.sh user_file.txt #!/bin/bash if [ $# -eq 0 ];then echo "usage:`basename $0` file" exit 1 fi + '[' 1 -eq 0 ']' if [ ! -f $1 ];then echo "error file" exit 2 fi + '[' '!' -f user_file.txt ']' i=/root/user_file.txt + i=/root/user_file.txt IFS=$'\n' + IFS=' ' for line in `cat $i` do if [ ${#line} -eq 0 ];then continue fi user=`echo $line|awk '{print $1}'` pass=`echo $line|awk '{print $2}'` id $user &>/dev/null if [ $? -eq 0 ];then echo "user $user already exists" else useradd $user echo $pass | passwd $user --stdin echo "$user is created" fi done cat $i ++ cat /root/user_file.txt + for line in '`cat $i`' + '[' 6 -eq 0 ']' echo $line|awk '{print $1}' ++ awk '{print $1}' ++ echo 'pp 123'注意：line获取的数值 + user=pp echo $line|awk '{print $2}' ++ awk '{print $2}' ++ echo 'pp 123' + pass=123 + id pp + '[' 1 -eq 0 ']' + useradd pp + echo 123 + passwd pp --stdin 更改用户 pp 的密码 。 passwd：所有的身份验证令牌已经成功更新。 + echo 'pp is created' pp is created
4、批量修改root用户密码
#!/bin/bash ############################### #user pass is check #v1.0 huangjiaping 2020-06-12 ############################### read -p "Please input your new passwd: " pass for ip in $(cat ip.txt) do { if [ ${#ip} -eq 0 ];then continue fi ping -c1 $ip &>/dev/null if [ $? -eq 0 ];then ssh $ip "echo $pass | passwd --stdin root" if [ $? -eq 0 ];then etho "$ip" >>ok_`date +%F`.txt else echo "$ip" >>fail_`date +%F`.txt fi else echo "$ip" >>fail_`date +%F`.txt fi }& done
实现效果：
4、实现一个系统工具箱
#!/bin/bash ################################ #system manage #v1.0,huangjiaping ############################### while : do menu(){ cat <<-EOF +....................................+ + h. help + + f. disk partition + + d. filesystem mount + + m. memory + + u. systemd load + + q. exit + +....................................+ EOF } read -p "please input [h for help: ]" action case "$action" in h) clear menu ;; f) fdisk -l ;; d) df -Th ;; u) uptime ;; q) break ;; "") ;; *) echo "error" ;; esac done echo "你退出了"
效果：
5、简单实现自动化安装apache
#!/bin/bash ########################## #install apache #v1.0 huangjiaping 2020-6-10 ########################## gateway=10.0.0.2 ping -c1 baidu.com &>/dev/null if [ $? -eq 0 ];then yum -y install httpd &>/dev/null systemctl restart httpd systemctl enable httpd sed -ri '/^SELINUX=/cSELINUX=disabled' /etc/selinux/config setenforce 0 curl http://127.0.0.1 &>/dev/null if [ $? -eq 0 ];then echo "Apache is installed" else echo "Apache is error" fi elif ping -c1 $gateway &>/dev/null;then echo "gateway is ok,check dns... " else echo "check ip address" fi
实现效果：
6、简单实现自动化多系统配置yum源
#!/bin/bash os_station=`cat /etc/redhat-release | awk '{print$4}' | awk -F"." '{print $1"."$2}'` yum_server=10.0.0.101 [ -d /etc/yum.repos.d ] || mkdir /etc/yum.repos.d/bak [ -d /etc/yum.repos.d/bak ] || mv /etc/yum.repos.d/* /etc/yum.repos.d/bak if [ "$os_station" = "7.4" ];then cat > /etc/yum.repos.d/centos7u3.repo <<-EOF [centos7] name=centos7 baseurl=file://$yum_server/centos7u3 enabled=1 gpgcheck=0 EOF echo "7.3 yum configure..." elif [ "$os_station" = "6.3" ];then cat > /etc/yum.repos.d/centos7u3.repo <<-EOF [centos7] name=centos7 baseurl=file://$yum.server/centos7u3 enabled=1 gpgcheck=0 EOF else echo "Error" fi
实现效果：
7、实现批量ip嗅探
#!/bin/bash for i in {2..200} do { ip=10.0.0.$i ping -c1 $ip &>/dev/null touch ip.txt if [ $? -eq 0 ];then echo "$ip is ok">>ip.txt else echo "$ip is no">>ip.txt fi }& done wait echo "finish..."
实现效果：
