shell编程进阶

2、编写脚本/root/bin/yesorno.sh，提示用户输入yes或no,并判断用户输入的是yes还是no,或是其它信息
read -p “Enter you choice yes|no:” Choice
Choice1=`echo $Choice | tr ‘[a-z]’ ‘[A-Z]’`
case $Choice1 in
Y|YES)
echo “you select yes.”
;;
N|NO)
echo “you select no.”
;;
*)
echo “you select others.”
;;
esac

3、编写脚本/root/bin/filetype.sh,判断用户输入文件路径，显示其文件类型（普通，目录，链接，其它文件类型）
read -p “Please input the filepath: ” f
if [ ! -e $f ];then
echo “the file is not exited,please input the right filepath” && exit
elif [ -f $f ];then
echo “the file is regular file”
elif [ -d $f ];then
echo “the file is directory file”
elif [ -l $f ];then
echo “the file is link file”
else
echo “the file is other type”
fi
4、编写脚本/root/bin/checkint.sh,判断用户输入的参数是否为正整数
read -p “please input : ” number
if [[ “$number” =~ ^[0-9]+$ ]];then
echo zhengshu
else
echo “not zhengshu”
fi
~
for
1、判断/var/目录下所有文件的类型
for type in /var/* ;do
if [ -h $type -o -L $type ];then
echo “the $type is a link file”
elif [ -f $type ];then
echo “the $type is a reguler file”
elif [ -d $type ];then
echo “the $type is a dir file”
elif [ -b $type ];then
echo “the $type is a block file”
elif [ -c $type ];then
echo “the $type is a character file”
elif [ -p $type ];then
echo “the $type is a pipe file”
else
echo “the $type is other file”
fi
done
wait
2、添加10个用户user1-user10，密码为8位随机字符
for uid in `seq 1 6`;do
grep “^user$uid\>” /etc/passwd &>/dev/null
if [ $? -eq 0 ];then
echo the user$uid is exited
else
useradd user”$uid”
passwd=`tr -dc ‘a-zA-Z0-9’ > /app/user.log
echo “$passwd” | passwd –stdin user”$uid” &> /dev/null && echo user”$uid” is created Suc
cessfully!!!
fi
done
3、/etc/rc.d/rc3.d目录下分别有多个以K开头和以S开头的文件；分别读取每个文件，以K开头的输出为文件加stop，以S开头的输出为文件名加start，如K34filename stop S66filename start
k=`ls /etc/rc.d/rc3.d | egrep -i “^k.*”`
s=`ls /etc/rc.d/rc3.d | egrep -i “^s.*”`
for fk in $k;do
echo -e “$fk\tstop”
done
for fs in $s;do
echo -e “$fs\tstart”
done
4、编写脚本，提示输入正整数n的值，计算1+2+…+n的总和
read -p “please input number: ” n
if [[ “$n” =~ ^[0-9]+$ ]];then
sum=0
for n in `seq $n`;do
let sum=sum+$n
done
echo “the sumnumber is $sum”
else
echo “please input right number!”
fi
5、计算100以内所有能被3整除的整数之和
sum=0
m=3
for n in `seq 100`;do
let a=n%m
if [ $a -eq 0 ];then
let sum=sum+n
fi
done
echo $sum
6、编写脚本，提示请输入网络地址，如192.168.0.0，判断输入的网段中主机在线状态
#!/bin/bash
read -p “Please input IP: ” ip
if [[ “$ip” =~ ([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3} ]];then
a=`echo $ip | cut -d. -f1-3`
for b in {0..254};do
{
if ping -c1 -W1 $a.$b &> /dev/null;then
echo $a.$b is up!
fi
}&
done
else
echo please input the right IP!
fi
wait
7、打印九九乘法表
for a in `seq 9`;do
for b in `seq $a`;do
echo -ne “$b*$a=$[$b*$a]\t”
done
echo
done
8、在/testdir目录下创建10个html文件,文件名格式为数字N（从1到10）加随机8个字母，如：1AbCdeFgH.html
#!/bin/bash
if [ ! -d /testdir ];then
mkdir /testdir/ &> /dev/null
fi
for n in {1..10};do
for a in `cat /dev/urandom |tr -dc “a-zA-Z”|head -c 8`;do
touch /testdir/$n$a.html
done
echo $n$a.html is already created!
done
9、打印等腰三角形
#!/bin/bash
read -p “请输出层数：” L
if [[ “$L” =~ ^[0-9]+$ ]];then
for k in `seq $L`;do
for a in `seq $[$L-$k]`;do
echo -n ” “
done
for b in `seq $[$k*2-1]`;do
echo -en “\033[3$Yan;5m?\033[0m”
done
echo
done
else
echo Please input the number!
fi

用while实现
1、编写脚本，求100以内所有正奇数之和
第一种：for
11
#!/bin/bash
declare -i num=0
for i in `seq 1 2 100`
do
num+=i
# num=$[$num+$i]
done
echo “sum is $num”
执行结果：
[root@os01 /]# ./1.sh
sum is 2500
第二种：while
#!/bin/bash
#
declare -i i=1
declare -i sum=0
while [ $i -le 100 ]
do
sum+=i
let i+=2
done
echo “sum is $sum”
#执行结果
[root@os01 /]# ./2.sh
sum is 2500
第三种：for contniue
#!/bin/bash
declare -i i=1
declare -i sum=0
for i in `seq 1 100`
do
if [ $[$i%2] -eq 0 ]
then
continue
fi
sum+=i
done
echo “sum is $sum”
#执行结果
[root@os01 /]# ./3.sh
sum is 2500

第四种:until
#!/bin/bash
#
declare -i i=0
declare -i sum=0
until [ $i -eq 100 ]
do
let i++
if [ $[$i%2] -eq 0 ]
then
continue
fi
sum+=i
done
echo “sum is $sum”
[root@os01 /]# ./4.sh
sum is 2500
2、编写脚本，提示请输入网络地址，如192.168.0.0，判断输入的网段中主机在线状态，并统计在线和离线主机各多少
#!/bin/bash
read -p “please input the ip(eg:172.18.0.1): ” ip
network=`echo $ip |cut -d “.” -f1-3` #C类地址前三位为网络id
i=1 #ip一般从1开始
up=0
down=0
while [ $i -le 254 ];do #255作为网段内的广播ip，所以取1-254之内的循环
if ping -c1 -w1 $network.$i > /dev/null;then #ping一次一秒
echo $network.$i is up!
let up++ #统计开机主机数
else
echo $network.$i is down!
let down++ #统计关机主机数
fi
let i++
done
3、编写脚本，打印九九乘法表
i=1
while [ $i -le 9 ];do
j=1
while [ $j -le $i ];do
mul=$[$i*$j]
echo -ne “$i*$j=$mul\t”
j=$[$j+1]
done
echo
i=$[$i+1]
done
4、编写脚本，利用变量RANDOM生成10个随机数字，输出这个10数字，并显示其中的最大值和最小值
random.sh

cat /dev/null > /root/random.txt
declare -i num=1
while [ $num -le 10 ];do
echo $RANDOM | tee -a /root/random.txt
let num++
done
echo “min: “
sort -n /root/random.txt | head -1
echo “max: “
sort -n /root/random.txt | tail -1

============================================

addr.sh

i=10
a=$RANDOM
max=$a
min=$a
while [ $i -ge 1 ]
do
[ $max -lt $a ] && max=$a
[ $min -gt $a ] && min=$a
echo “$a”
a=$RANDOM
let i–
done
echo “最大值$max”
echo “最小值$min”

============================================

declare -i MAX=0
declare -i MIN=0
for I in {1..10};do
MYRAND=$RANDOM
[ $I -eq 1 ] && MIN=$RANDOM
if [ $I -le 9 ];then
echo -n “$MYRAND,”
else
echo “$MYRAND”
fi
[ $MYRAND -gt $MAX ] && MAX=$MYRAND
[ $MYRAND -lt $MIN ] && MIN=$MYRAND
done
echo $MAX,$MIN
5、编写脚本，实现打印国际象棋棋盘
#!/bin/bash
k=0
while [ $k -lt 4 ];do
l=0
while [ $l -lt 4 ];do
echo -ne “\033[41m \033[0m”
echo -ne “\033[43m \033[0m”
let l++
done
echo
l=0
while [ $l -lt 4 ];do
echo -ne “\033[41m \033[0m”
echo -ne “\033[43m \033[0m”
let l++
done
echo
l=0
while [ $l -lt 4 ];do
echo -ne “\033[43m \033[0m”
echo -ne “\033[41m \033[0m”
let l++
done
echo
l=0
while [ $l -lt 4 ];do
echo -ne “\033[43m \033[0m”
echo -ne “\033[41m \033[0m”
let l++
done
echo
let k++
done