文章目录
  1. 1. /bin/sh
  2. 2. check the parameters
  3. 3. /bin/bash
  4. 4. /bin/bash
  5. 5. awk ‘{print $1}’ log |sort |uniq -c|sort -r |head -n10
  6. 6. /bin/bash
  7. 7. time for i in {1..2000} ; do mkdir /root/neil$i; done
  1. 利用top取某个进程的CPU的脚本:

    /bin/sh

    Max_CPU=0
    Avg_CPU=0
    Total_Time=1
    Process=$1
    Interval=$2

    check the parameters

    if [ $# -ne 2 ]; then

     echo "Usage: $0 ProcessName Interval"
     exit
    

    fi
    LogFile=”Per.txt”
    echo “date” > $LogFile
    while sleep $Interval
    do

     top -d 1 -n 1|grep $Process|grep -v grep|awk '{print $9"\t"$10}' >> $LogFile
    

    done

  2. 判断是否是设备文件

    /bin/bash

    echo -e “The program will Judge a file is or not a device file.\n\n”
    read -p “Input a filename:” filename
    if [ -b $filename -o -c $filename ]; then

          echo "$filename is a device file"
          exit 0
    

    else

          echo "$filename is not a device file"
          exit 1
    

    firead –p:用于在读数据时输出提示信息

    注意! [ 之间是有空格的:if ! [ -f $filename ] ; then。一般用if [ ! * ]

  3. 添加用户:

    /bin/bash

    groupadd -f class1
    for i in {9909..9911}
    do

         xx=echo $i | sed 's/99//g'
         useradd -g class1 std${xx}
         echo std${xx} | passwd std${xx} --stdin
         echo -e "user std${xx} passwd is std${xx}">>/root/newuser.txt
    

    done
    exit 0

        注意等号的前后不要有空格:xx=echo $i | sed 's/99//g'
        变量如果前后有字符,要是大括号
    
  4. 统计IP访问:
    要求分析apache访问日志,找出访问页面数量在前100位的IP数。日志大小在78M左右。以下是apache的访问日志节选

    202.101.129.218 - - [26/Mar/2006:23:59:55 +0800] “GET /online/stat_inst.php?pid=d065 HTTP/1.1” 302 20-“-“ “-“ “Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)”

    awk ‘{print $1}’ log |sort |uniq -c|sort -r |head -n10

       5 221.224.78.15
       3 221.233.19.137
        1 58.63.148.135
        1 222.90.66.142
        1 222.218.90.239
        1 222.182.95.155
        1 221.7.249.206
        1 221.237.232.191
        1 221.235.61.109
        1 219.129.183.122
    

    这个地方有个疑问,为什么在使用uniq之前要sort。

  5. 求2个数之和

    /bin/bash

    typeset first second
    read -p “Input the first number:” first
    read -p “Input the second number:” second
    result=$[$first+$second]
    echo “result is : $result”
    exit 0

  6. 文本分析
    取出password中shell出现的次数

    第一种方法结果:

        4 /bin/bash
        1 /bin/sync
        1 /sbin/halt
       31 /sbin/nologin
        1 /sbin/shutdown
    

    第二种方法结果:
    /bin/sync 1
    /bin/bash 1
    /sbin/nologin 30
    /sbin/halt 1
    /sbin/shutdown 1

    答案:
    cat /etc/passwd|awk -F: ‘{if ($7!=””) print $7}’|sort|uniq –c
    cat /etc/passwd|awk -F: ‘{if ($7!=””) print $7}’|sort|uniq -c | awk ‘{print $2,$1}’

  7. 文件整理
    employee文件中记录了工号和姓名
    employee.txt:
    100 Jason Smith
    200 John Doe
    300 Sanjay Gupta
    400 Ashok Sharma
    bonus文件中记录工号和工资
    bonus.txt:
    100 $5,000
    200 $500
    300 $3,000
    400 $1,250

  8. 要求把两个文件合并并输出如下
    处理结果
    400 ashok sharma $1,250
    100 jason smith $5,000
    200 john doe $500
    300 sanjay gupta $3,000

    答案:join employee bonus | sort -k 2

  9. 打印本机的交换分区大小

    处理结果:
    Swap:1024M
    free -m | sed -n ‘/Swap/p’ | awk ‘{ print $2}’
    free -m | sed -n ‘s/Swap:\ ([0-9]).*/\1/p’

  10. 输出本机创建20000个目录所用的时间

    处理结果:
    real 0m3.367s
    user 0m0.066s
    sys 0m1.925s

    答案:

    time for i in {1..2000} ; do mkdir /root/neil$i; done

    real 0m6.200s
    user 0m1.128s
    sys 0m4.710s

  11. 打印当前sshd的端口和进程id

    处理结果:
    sshd Port&&pid: 22 5412
    答案:netstat -anp | grep sshd | sed -n ‘s/.:::([0-9])\ . \ ([0-9])\/sshd/\1 \2/p’

  12. 打印root可以使用可执行文件数

    处理结果:
    root’s bins: 2306
    echo “root’s bins: $(find ./ -type f | xargs ls -l | sed ‘/-..x/p’ | wc -l)”
    root’s bins: 3664

  13. 编译当前目录下的所有.c文件:

    for file in *.c; do echo $file ; gcc -o $(basename $file .c) $file ; sleep 2; done > compile 2>&1

  14. 将一目录下所有的文件的扩展名改为bak

    for i in .;do mv $i ${i%%.*}.bak;done

转自:oychw.cublog.cn

文章目录
  1. 1. /bin/sh
  2. 2. check the parameters
  3. 3. /bin/bash
  4. 4. /bin/bash
  5. 5. awk ‘{print $1}’ log |sort |uniq -c|sort -r |head -n10
  6. 6. /bin/bash
  7. 7. time for i in {1..2000} ; do mkdir /root/neil$i; done