Several shell face questions and answers

Enterprise Face question 1:

The following string is known to be passed random number variable After intercepting the results, please crack these strings corresponding to the md5sum ago corresponding numbers?

21029299

00205d1c

a3da1677

1f6d12dd

890684b

Problem-solving ideas: the way to pass a parameter each time, to achieve sequential cracking

The range of $RANDOM is 0-32767

        #!/bin/bash        # author: liuwei         #Site: www.51liuzw.com         for n in {0..32767}         do            md5= ' echo  $n  |  md5sum | cut -c 1-8 '              if [  "$MD 5"  ==  "$"  ];then                 echo  "$n  is."                 exit             else                 echo "$n  no."             fi         done

Note: You can also use the method of defining an array to compare all at once

        #!/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 ${array[@]};d o                         if  [  "$MD 5"  ==  "$i"  ];then                                  echo  "$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

Enterprise Face question 2: Batch Check multiple Web site addresses are normal

Requirements: Shell array method Implementation, detection strategy as far as possible to simulate user access ideas

Http://www.baidu.com

Http://www.taobao.com

Http://www.51liuzw.com

http://192.168.50.199

#!/bin/bash#author: liuwei#site: www.51liuzw.comarray= (HTTP// www.baidu.comhttp://www.taobao.comhttp://www.51liuzw.comhttp://192.168.50.199) for n in ${array[ *]};d o        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"         fidone 

Results:

#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

Enterprise Face question 3: : Use Shell to process the following content

1 , sorted by the frequency of word occurrence in descending order!

2 , in descending order by the frequency of letters!

The Squid project provides a number of resources toassist users design,implement and support squid installations. Browsethe documentation and support sections for more infomation

    1. Sort by the frequency of word occurrences in descending order!

Workaround: Change the spaces to line breaks and sort the statistics    

#sed ' s# #\n#g ' c.txt | Sort | Uniq-c

    2. descending order by the frequency of letters!

Solution: Use Grep-o "\w" to take apart the words and remove the symbols of the species.

#cat C.txt | Grep-o "\w" | Sort | Uniq-c

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Several shell face questions and answers