企業面試題1:
已知下面的字元串是通過RANDOM随機數變量md5sum|cut-c 1-8截取後的結果,請破解這些字元串對應的md5sum前的RANDOM對應數字?
21029299
00205d1c
a3da1677
1f6d12dd
890684b
解題思路:通過每次傳遞一個參數的方式,來實作依次破解
$RANDOM的範圍為0-32767
#!/bin/bash
#Author: liuwei
#Site: www.51liuzw.com
for n in {0..32767}
do
MD5=`echo $n | md5sum | cut -c 1-8`
if [ "$MD5" == "$1" ];then
echo "$n is."
exit
else
echo "$n no."
fi
done
注:也可以通過定義數組的方法,來一次全部對比
#!/bin/bash
#Author: liuwei
#Site: www.51liuzw.com
array=(
00205d1c
21029299
a3da1677
1f6d12dd
890684b
)
for n in {0..32767}
do
MD5=`echo $n | md5sum | cut -c 1-8`
for i in ${array[@]};do
if [ "$MD5" == "$i" ];then
echo "$n and $i" >> c.log
break
else
echo "$n no."
fi
done
done
#cat c.log
1346 and 00205d1c
7041 and 1f6d12dd
25345 and a3da1677
25667 and 21029299
企業面試題2:批量檢查多個網站位址是否正常
要求:shell數組方法實作,檢測政策盡量模拟使用者通路思路
http://www.baidu.com
http://www.taobao.com
http://www.51liuzw.com
http://192.168.50.199
#!/bin/bash
#Author: liuwei
#Site: www.51liuzw.com
array=(
http://www.baidu.com
http://www.taobao.com
http://www.51liuzw.com
http://192.168.50.199
)
for n in ${array[*]};do
URL=`curl -I -m 2 $n 2> /dev/null | egrep "200|302" | wc -l`
if [ "$URL" -eq 1 ];then
echo "$n is OK"
else
echo "$n is not OK"
fi
done
結果:
#sh test.sh
http://www.baidu.com is OK
http://www.taobao.com is OK
http://www.51liuzw.com is not OK
http://192.168.50.199 is not OK
企業面試題3::用shell處理以下内容
1、按單詞出現頻率降序排序!
2、按字母出現頻率降序排序!
the squid project provides a number of resources toassist users design,implement and support squid installations. Please browsethe documentation and support sections for more infomation
1.按單詞出現頻率降序排序!
解決思路:把空格換為換行符,并排序統計
#sed 's# #\n#g' c.txt | sort | uniq -c
2.按字母出現頻率降序排序!
解決思路:使用grep -o "\w",把單詞拆開并去除種各符号
#cat c.txt | grep -o "\w" | sort | uniq -c