shell脚本面试题
1：开发Shell脚本判断系统根分区剩余空间的大小，如果低于1000MB就提示不足，否则提示充足。
#!/bin/bash
m=`df -m | awk '{print $4}' | sed -n 2p`
if [ $m -gt 1000 ] ; then
echo "充足"
else
echo "不足"
fi
2：分别使用变量定义、read读入及脚本传参方式实现比较2个整数的大小。
#!/bin/bash
read -p "请输入两个数：" num1 num2
a=$num1
b=$num2
if [ "echo "$a" | sed -r 's/[^0-9]//g'"="$a" ];then
if [ "echo "$b" | sed -r 's/[^0-9]//g'"="$a" ];then
if [ $a -eq $b ];then
echo "两个数一般大"
elif [ $a -gt $b ];then
echo "第一个数比第二个数大"
else
echo "第二个数比第一个数大"
fi
else
echo "第二个数不是整数"
fi
else
echo "第一个数不是整数"
fi
3：打印一个菜单如下，当用户选择对应的数字时，就执行对应项的应用，最好对用户的输入进行是否为整数判断。
1.install lamp
2.install lnmp
3.exit
#!/bin/bash
# Author: Peter zh
# Blog: https://www.cnblogs.com/zhangwduoduoj/
# Time: 2019-08-24 17:45:43
# Name: install.sh
# Version: v1.0
# Description: This is a Script.
cat << EOF
1.install lamp
2.install lnmp
3.exit
EOF
read -p "please input choice" a
if [ -n "$(echo $a| sed -n "/^[0-9]\+$/p")" ];then
echo "please input num"
fi
if [ $a -eq 1 ];then
yum install httpd mysql php -y
elif [ $a -eq 2 ];then
yum install nginx mysql php -y
elif [ $a -eq 3 ];then
exit 0
fi
4：通过脚本传参的方式，检查Web网站URL是否正常（要求主体使用函数）。
####可以使用curl 命令取状态吗 与wget同理
curl -I -m 10 -o /dev/null -s -w %{http_code} www.baidu.com
#!/bin/bash
# Author: Peter zh
# Blog: https://www.cnblogs.com/zhangwduoduoj/
# Time: 2019-08-24 14:31:53
# Name: url.sh
# Version: v1.0
# Description: This is a Script.
function_url(){
wget --spider -T 5 -q -t 2 $1
if [ $? -eq 0 ];then
echo 'OK!'
else
echo 'error..'
fi
}
function_url $1
5：利用case语句开发Rsync服务启动停止脚本，并能通过chkconfig实现开机自启动。
1 #!/bin/bash
2 # Author: Peter zh
3 # Blog: https://www.cnblogs.com/zhangwduoduoj/
4 # Time: 2019-08-24 14:35:58
5 # Name: rsync.sh
6 # Version: v1.0
7 # Description: This is a Script.
8 chkconfig rpcbind on
9 chkconfig rsync on
10 function_start(){
11 rsync --daemon
12 if [ $? -eq 0 ]
13 then
14 echo 'rsync is start'
15 else
16 echo 'error..'
17 fi
18 }
19 function_stop(){
20 pkill rsync
21 if [ $? -eq 0 ]
22 then
23 echo 'rsync is stop'
24 else
25 echo 'errorrr..'
26 fi
27 }
28 function_restart(){
29 function_start
30 function_stop
31 }
32 case $1 in
33 start)
34 function_start
35 ;;
36 stop)
37 function_stop
38 ;;
39 restart)
40 function_restart
41 ;;
42 *)
43 echo "Usage:start|stop|restart"
44 ;;
45 esac
6：猜数字游戏。首先让系统随机生成一个数字，给这个数字定一个范围（1-60），让用户输入猜的数字，对输入进行判断，如果不符合要求，就给予高或低的提示，猜对后则给出猜对用的次数，请用while语句实现。
#!/bin/bash
# Author: Peter zh
# Blog: https://www.cnblogs.com/zhangwduoduoj/
# Time: 2019-08-24 17:11:05
# Name: random.sh
# Version: v1.0
# Description: This is a Script.
sum1=0
sum2=0
number_range=$((RANDOM%60))
while :
do
read -p "please input intger>> " num
if [[ $num == "quit" ]];then
exit 0
fi
#echo $number_range
if [ $num -lt $number_range ]
then
echo "little"
let sum1++
elif [ $num -gt $number_range ];then
echo 'big'
let sum2++
elif [ $num -eq $number_range ];then
echo "all guess $((sum1+sum2+1))"
fi
done
7：分析nginx访问日志(自备)，把日志中每行的访问字节数对应字段数字相加，计算出总的访问量。给出实现程序，请用while循环实现。
#!/bin/bash
# Author: Peter zh
# Blog: https://www.cnblogs.com/zhangwduoduoj/
# Time: 2019-08-24 15:06:04
# Name: nginxlog.sh
# Version: v1.0
# Description: This is a Script.
sum=0
exec < /application/nginx/logs/access.log
while read line
do
b=`echo "$line" | awk '{print $10}'`
if [ $? -eq 0 ]; then
sum=$(($sum+$b))
fi
done
echo $sum
8：计算从1加到100之和（要求用for和while，至少给出两种方法）。
#!/bin/bash
sum=0
for i in {1..100}
do
let sum+=i
done
echo `seq -s "+" 100`"="$sum
9：利用bash for循环打印下面这句话中字母数不大于6的单词（某企业面试真题）。I am zzz teacher welcome to zzzzzz training class
#!/bin/bash
# Author: Peter zh
# Blog: https://www.cnblogs.com/zhangwduoduoj/
# Time: 2019-08-24 15:11:52
# Name: 6.sh
# Version: v1.0
# Description: This is a Script.
a="I am zzz teacher welcome to zzzzzz training class"
b=`echo $a |tr " " "\n"`
for i in $b
do
if [[ `echo $i|wc -L` < 6 ]];then
echo $i
fi
done
提示:判断字符串长度的方法
1.wc -L
2.echo $(expr length $变量名)
3.echo ${#变量名}
10：使用read读入方式比较两个整数大小，要求对用户输入的内容严格判断是否为整数，是否输入了两个数字。
#!/bin/bash
# Author: Peter zh
# Blog: https://www.cnblogs.com/zhangwduoduoj/
# Time: 2019-08-24 17:24:21
# Name: bijiao.sh
# Version: v1.0
# Description: This is a Script.
read -p "first:" a
read -p "second:" b
if [[ -z $a || -z $b ]];then
echo "please input num---"
exit 1
fi
if [[ -n "$(echo $a| sed -n "/^[0-9]\+$/p")" && -n "$(echo $b| sed -n "/^[0-9]\+$/p")" ]];then
if [ $a -lt $b ];then
echo "big----small" $b $a
elif [ $a -gt $b ];then
echo "big----small" $a $b
else
echo 'same num'
fi
else
echo "dont want abcd!#%^&...."
fi
11.关闭chkconfig命令中所有第5阶段下的程序，全都写成off
#!/bin/bash
# Author: Peter zh
# Blog: https://www.cnblogs.com/zhangwduoduoj/
# Time: 2019-08-21 11:08:30
# Name: chkconfig.sh
# Version: v1.0
# Description: This is a Script.
chk=`chkconfig --list|awk '{print $1}'`
for i in $chk
do
judge=`chkconfig $i --list |awk '{print $7}'|cut -d: -f2`
if [[ $judge == "off" ]];then
echo "$i dont need off ,already off"
else
chkconfig --level 5 $i off
fi
done
