shell脚本实例三
1.脚本编写
vim checkhost.sh
#!/bin/bash
Auto_conn()
{
/usr/bin/expect << EOF
set timeout 2
spawn ssh root@$1 $2
expect {
"yes/no" {send "yes\r";exp_continue }
"password" {send "westos\r" }
}
expect eof
EOF
}
for i in {75..79}
do
ping -w1 -c1 172.25.254.$i &>> /dev/null && {
IP=172.25.254.$i
hn=`Auto_conn $IP hostname|grep -E "ECDSA|authenticity|connecting|Warning|password|spawn" -v`
echo $hn $IP >> /mnt/dns_file
sed 's/^M//g ' -i /mnt/dns_file
}
done
练习二：有分针秒针的倒计时
vim daojishi1.sh
#!/bin/bash
for ((i=70;i>0;i--))
do
shi=$((i/60))
miao=$((i%60))
echo -ne "\r倒计时：还有$shi分 $miao 秒结束"
sleep 2
done
echo -ne "\r倒计时：0分 0秒！！"
练习三：两个文件分别为userlist和passlist，每行作为对应的用户和密码并进行创建，并对各种情况做出说明！
[root@desktop5 mnt]# cat users_create.sh
#!/bin/bash
[ "$USER" = "root" ]||{
echo -e "\033[31mplease use rootuser!!\033[0m"
exit
}
[ -z "$1" -o -z "$2" ]&&{
echo -e "\033[31mparamater is not two!!\033[0m"
exit
}
[ ! -e "$1" -o ! -e "$2" ]&&{
echo -e "\033[31mfile is not exist!!\033[0m"
exit
}
num1=`wc -l $1|cut -d " " -f 1`
num2=`wc -l $2|cut -d " " -f 1`
[ "$num1" = "$num2" ]&&{
for i in `seq 1 $num1`
do
user=`sed -n ${i}p $1`
ps=`sed -n ${i}p $2`
dge=`getent passwd $user`
if [ -z "$dge" ]
then
useradd $user
echo $ps | passwd --stdin $user &> /dev/null
else
echo -e "\033[31m$user is already exit!!\033[0m"
fi
done
}||{
echo -e "\033[31m$1 和 $2 行数不一致!!\033[0m"
exit
}
练习四:数据库的备份
[root@desktop5 mnt]# cat mariadb.sh
#!/bin/bash
[ -z "$1" ]&&{
echo nopass
exit
}
#用来判断mariadb是否安装
DBCHECK=`rpm -qa | grep mariadb-server`
if [ -z "$DBCHECK" ]
then
echo database software no install!!
exit 1
fi
#判断是否开启mariadb服务
DB_STATE=`mysql -uroot -p$1 -e "show databases;" 2>&1 | awk '/sock/{print}'`
if [ ! -z "$DB_STATE" ]
then
echo DB not start!!
exit 2
fi
#判断密码是否正确
DB_STATE=`mysql -uroot -p$1 -e "show databases;"`
if [ "$?" != "0" ]
then
echo DB passwd erro!!
exit 3
fi
#创建目录
until [ -e "/mnt/mysqldump" ]
do
mkdir -p /mnt/mysqldump
done
for DB_NAME in `mysql -uroot -p$1 -e "show databases;" -NE | grep -E "\*|chema" -v `
do
[ ! -e "/mnt/mysqldump/${DB_NAME}.sql" ]&&{
mysqldump -uroot -p$1 $DB_NAME > /mnt/mysqldump/$DB_NAME.sql
}||{
echo "/mnt/mysqldump/${DB_NAME}.sql is exist you can do this:"
echo "[S]kip [B]ackup [O]verwrite"
read -p "please input action:" ACTION1
ACTION=`echo $ACTION1 | tr 'a-z' 'A-Z'`
case $ACTION in
S)
echo skip it!!
;;
B)
mv /mnt/mysqldump/${DB_NAME}.sql /mnt/mysqldump/${DB_NAME}_backup.sql
mysqldump -uroot -p$1 $DB_NAME > /mnt/mysqldump/${DB_NAME}.sql
echo backup file create success!!
;;
O)
mysqldump -uroot -p$1 $DB_NAME > /mnt/mysqldump/${DB_NAME}.sql
echo overwrite is ok!!
;;
*)
echo no sign
esac
}
done
