shell 脚本基础
!/bin/bash判断172.40.51.0网段有多少是开关机状态
x=0
y=0
for i in seq 254
do
ping -c1 -i0.1 -W1 172.40.51.$i
if [ $? -eq 0 ];then
echo "172.40.51.$i is up"
let x++
else
echo "172.40.51.$i is down"
let y++
fi
done
echo "开机的有$x个，关机的有$y个。"
1加到100的和
tmp=0
foriin{1..100}
do
let tmp=$i+$tmp
done
echo "总和:$tmp"
随机猜奖
u=0
num=$[ RANDOM%100+1 ]
while :
do
read -p "随即猜：" ca
if [ $ca -eq $num ];then
echo“恭喜中奖”
exit
elif [ $ca -gt $num ];then
echo “猜大了”
else
echo “猜小了”
fi
let u++
done
echo "你猜了$u次"
阉割版if
case "$1" in
-n)
touch $2;;
-e)
vim$2;;
-c)
cat $2;;
-r)
rm -rf $2;;
*)
echo "usage:$0 (-n|-e|-c|-r) 文件名"
esac
加法计算机
tmp=0
while :
do
read -p "请输入一个数：" shu
let tmp+=$shu
[ $shu -eq 0 ] && break
done
echo "总和$tmp"
99乘法表
for i in {1..9}
do
for j in seq $i
do
echo -n " $i$j=$j]"
done
echo -e
done
棋盘
for i in {1..10}
do
for j in {1..10}
do
he=$
if [ $[$he%2] -eq 0 ];then
echo -en "\033[45m\033[0m"
else
echo -en "\033[47m\033[0m"
fi
done
echo -e
done
用户创建
read -p "请创建用户：" user
echo "必须创建用户"
if [ -z "$user" ];then
while :
do
read -p "请创建用户：" user
[ $? -ne 0 ] && exit
[ -n "$user" ]&& break
done
fi
stty -echo
read -p "请创建密码：" pass
stty echo
pass=${pass:-123456}
useradd "$user"
echo "$pass" |passwd --stdin "$user"
自动 远程操作
rm /root/.ssh/known_host
i=172.25.0.10
expect /dev/null
yum repolist
yum -y install gcc pcre-deveopenssl-devel>/dev/null
xi(){
while :
do
echo -ne '\033[42m \033[0m'
sleep 1
done
}
xi &
if [ $? -eq 0 ];then
./configure >/dev/null
fi
make>/dev/null
make install>/dev/null
cd ..
kill $!
i=ls /usr/local/nginx/
if [ $? -eq 0 ];then
echo OK
else
echo 失败
fi
nginx的启动服务
case $1 in
start)
/usr/local/nginx/sbin/nginx;;
stop)
/usr/local/nginx/sbin/nginx -s stop;;
restart)
/usr/local/nginx/sbin/nginx -s stop
/usr/local/nginx/sbin/nginx;;
status)
netstat -ntulp|grep nginx;;
*)
echo"请正确输入";;
esac
拒绝访问失败的ip
awk '/Failed/{print $11}'/var/log/secure >> ip.txt
if [ -d ip.txt];then
echoip.txt没有内容
else
u=cat ip.txt
for i in$u
do
iptables-I INPUT -s 172.25.0.$i -j DROP
done
fi
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