运维编程题

近来参加面试,遇到几个运维编程题,在这里作一些记录。html

 

使用for循环在/oldboy目录下经过随机小写10个字母加固定字符串oldboy批量建立10个html文件。面试

#!/bin/bash
letter=(`echo {a..z}`)

function create_filename()
{
filename=`for i in $(seq 10)
do
echo -n ${letter[$((RANDOM%24))]}
done`_oldboy.html
}
fori in $(seq 10)
do
create_filename
touch $filename
done

用两种将以上文件名中的oldboy所有改为oldgirl(用for循环实现),而且html改为大写编程

#!/bin/bash

filelist=`ls |grep ".html$"`

for i in $filelist

do

mv $i ${i%%_*}_oldgirl.HTML

done
#!/bin/bash  
filelist=`ls | grep ".html$"`  
for i in $filelist  
do  
newfile=`echo $i | awk -F'_' '{print $1"_oldgirl.HTML"}'`  
mv $i $newfile  
done 

  

批量建立10个系统账号oldboy01-oldboy10并设置密码(密码为随机8位字符串)。bash

#!/bin/bash  
for i in `seq 10`  
do  
if [[ $i -lt 10 ]];then  
useradd oldboy0$i && echo `cat /dev/urandom | sed 's/[^a-zA-Z0-9]//g' | strings -n 8 | head -n 1` | passwd oldboy0$i --stdin  
else useradd oldboy$i && echo `cat /dev/urandom | sed 's/[^a-zA-Z0-9]//g' | strings -n 8 | head -n 1` | passwd oldboy$i --stdin  
fi  
done 

  

写一个脚本,实现判断10.0.0.0/24网络里,当前在线用户的IP有哪些网络

单进程运维

#!/bin/bash  
  
for i in `seq 2 255`  
do  
ping 10.0.0.$i -c 1 1>/dev/null && echo 10.0.0.$i: live || echo 10.0.0.$i: dead  
done  

  

 

多进程dom

#!/bin/bash  
tmp_fifofile="/tmp/$$.fifo"  
mkfifo $tmp_fifofile  
exec 6<>$tmp_fifofile  
rm -rf $tmp_fifofile  
  
thread=254  
for ((i=0;i<$thread;i++))  
do  
echo ""  
done >&6  
  
for ((i=1;i<254;i++))  
do  
read -u6  
        {  
        ping 10.0.0.$i -c 1 1>/dev/null && echo 10.0.0.$i: live || echo 10.0.0.$i: dead  
        echo "">&6  
        } &  
done  
wait  
exec 6>&-  
  
exit 0  

 

bash for循环打印下面这句话中字母数不大于6的单词ide

#!/bin/bash
content="I am oldboy teacher welcome to oldboy training class."
new_content=`echo $content |sed 's/\.//'`
echo $new_content
arg=(`echo $new_content`)
for i in ${arg[@]}
do
if [[ ${#i} -le 6 ]] ;then
echo $i
fi
done

  

已知下面的字符串是经过RANDOM随机数变量md5sum|cut-c 1-8截取后的结果,请破解这些字符串对应的md5sum前的RANDOM对应数字?spa

210292993d

00205d1c

a3da1677

1f6d12dd

890684b

 

 

 

 1 #!/bin/bash  
 2 declare -a array  
 3   
 4 for i in $(seq 0 32767)  
 5 do  
 6 array[$i]=`echo $i | md5sum | cut -c 1-8`  
 7 done  
 8   
 9 keys=([0]=21029299 [1]=00205d1c [2]=a3da1677 [3]=1f6d12dd [4]=890684b)  
10 echo "number ------- md5sum"  
11 for key in ${keys[@]}  
12 do  
13 for i in `seq 0 32767`  
14 do  
15 if [[ "${array[i]}" == "$key" ]];then  
16 echo $i ------- $key  
17 fi  
18 done  
19 done  
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