shell脚本实例(2)

1.传给脚本一个参数：目录，输出该目录中文件最大的，文件名和文件大小

#!/bin/bash
if [ $# -ne 1 -o ! -d $1 ];then
  echo "Args is error."
  exit 3
fi

LC=`du -a $1 | wc -l`
for I in `seq $LC` ;do
  size=`du -a $1 | sort -nr | head -$I | tail -1 | awk '{print $1}'`
  filename=`du -a $1 | sort -nr | head -$I | tail -1 | awk '{print $2}'`
  if [ -f $filename ];then
   echo "The big file is $filename ,Size is $size."
   break
  fi
done

2.查询当前192.168.1.x网段内，那些IP被使用了，输出这些IP到一个文件中。

#!/bin/bash

for I in {1..254};do
  N=`ping -c 1 192.168.1.$I | awk -F, '/received/ {print $2}' | cut -d' ' -f2`
  [ $N -eq 1 ] && echo "192.168.1.$I" >>/tmp/ips.txt
done

3.把shell为bash的用户输出到/tmp/users.txt中

#!/bin/bash
LC=`wc -l /etc/passwd | awk '{print $1}'`
N=1
for I in `seq $LC` ;do
  SHE=`head -$I /etc/passwd | tail -1 | cut -d: -f7`
  U=`head -$I /etc/passwd | tail -1 | cut -d: -f1`
  if [ $SHE == '/bin/bash' ];then
   echo -e "$N 	 $U" >> /tmp/users.txt
   N=$[$N+1]
  fi
done

4.依次向/etc/passwd中的每个用户问好，输出用户名和id，并统计一共有多少个用户

(1)写法一

#!/bin/bash
file="/etc/passwd"
LINES=`wc -l $file | cut -d" " -f1`
for I in `seq 1 $LINES`;do
userid=`head -$I $file | tail -1 |cut -d: -f3`
username=`head -$I $file | tail -1 |cut -d: -f1`
echo "hello $username,your UID is $userid"
done
echo "there are $LINES users"

(2).写法二

#!/bin/bash
file=/etc/passwd
let num=0
for I in `cat $file`;do
username=`echo "$I" | cut -d: -f1`
userid=`echo "$I" | cut -d: -f3`
echo "Hello,$username,your UID is $userid"
num=$[$num+1]
done
echo "there are $num users"

5.切换工作目录到/var ，依次向/var 目录中每个文件或子目录问好(形如：Hello,log),并统计/var目录下共有多少个文件显示出来

(提示：for File in /var/*;或 for File in 'ls /var ')

#!/bin/bash
 cd /var
 let num=0
 for I in `ls /var/*`;do
 echo "hello $I"
 num=$[$num+1]
 done
 echo "the number of files is $num"

6.循环读取文件/etc/passwd的第2,4,6,10,13,15行，并显示其内容，然后把这些行保存到/tmp/mypasswd文件中

#!/bin/bash
file="/etc/passwd"
for I in 2 4 6 10 13 15;do
exec 3>/tmp/mypasswd
line=`head -$I $file | tail -1`
echo "$line"
echo "$line" >&3
exec 3>&-
done

7,写一个脚本

　　(1)显示当前系统日期和时间，而后创建目录/tmp/lstest

　　(2)切换工作目录至/tmp/lstest

(3)创建目录a1d，b56e，6test

(4)创建空文件xy，x2y，732

(5)列出当前目录下以a，x或者6开头的文件或目录

(6)列出当前目录下以字母开头，后跟一个任意数字，而后跟任意长度字符的文件或目录　

#!/bin/bash
 
date
mkdir -pv /tmp/lstest
cd /tmp/lstest
mkdir a1d b56e 6test
touch xy x2y 732
ls [ax6]*
ls [[:alpha:]][[:digit:]]*

8.添加10个用户user1到user10，但要求只有用户不存在的情况下才能添加

 #!/bin/bash
   for I in `seq 1 10`;do
   cut -d: -f1 /etc/passwd |grep "user$I" 2>>/tmp/etc.err || useradd user$I
   done

9.通过ping命令测试192.168.0.151到192.168.0.254之间的所有主机是否在线
如果在线，就显示“ip is up”
如果不在线，就显示“ip is down”　　

#!/bin/bash
   for I in `seq 151 254`;do
   ping -c1 -w1 192.168.0.$I &>/dev/null && echo "192.168.0.$I is up" ||        echo "192.168.0.$I is down"
   done

10.zookeeper一个节点通过脚本启动所有的节点

#!/bin/bash

if [ $# -ne 1 ]
then
        echo "please give a parameter to tell me what to do for example [start|stop|restart|status]" && exit 1
fi
echo "$1 zkServer in every node......"

list=`cat /usr/local/zookeeper-3.4.6/conf/zoo.cfg | grep server | awk -F : '{print $1}' | awk -F '=' '{print $2}'`

for i in $list
do
        echo "$1 zkServer in $i......"
        ssh $i "/usr/local/zookeeper-3.4.6/bin/zkServer.sh $1" &> /dev/null
done

for i in $list
do
        echo "show zkServer status in $i......"
        ssh $i "/usr/local/zookeeper-3.4.6/bin/zkServer.sh status"
done