1.编写函数，实现打印绿色OK和红色FAILED

判断是否有参数，存在为Ok，不存在为FAILED

[root@cotenos day06]# vim colour.sh
 

#!/bin/bash
test(){
    if [ -z $1 ];then
            echo -e "\033[31m FAILED \033[0m"
    else
             echo -e "\033[32m OK \033[0m"
    fi
}

test

执行结果：

[root@cotenos day06]# bash colour.sh

 

2.编写函数，实现判断是否无位置参数，如无参数，提示错误

[root@cotenos day06]# vim hanshu.sh

#!/bin/bash
test(){
    if [ $# -ne 0 ];then
            echo "parameters exists"
    else
            echo" error "
    fi
}

read -p " please input parameter: " i
test302 $i

执行：

[root@cotenos day06]# bash hanshu.sh 

 

3.编写函数实现两个数字做为参数，返回最大值

[root@cotenos day06]# vim test3.sh
 

#!/bin/bash
read -p "请输入两个数:" num1 num2
test3(){
    if [ $num1 -gt $num2 ];then
            echo "max is $num1"
    elif [ $num1 -lt $num2 ];then
             echo " max is $num2 "
    else
            echo " The number are equa"
    fi
}

test3 $num1 $num2

运行：

[root@cotenos day06]# bash test3.sh 

4.编写函数，实现两个整数位参数，计算加减乘除。

[root@cotenos day06]# vim test4.sh

#!/bin/bash
read -p "please input two number:" num1 num2
test304 (){
        expr $num1+$mun2 >&/dev/null
        if [ $# -ne 0 ];
        then
                echo "$num1+$num2=$[$num1+$num2]"
                echo "$num1-$num2=$[$num1-$num2]"
                echo "$num1*$num2=$[$num1*$num2]"
                echo "$num1/$num2=$[$num1/$num2]"
                
        else    
                echo "is not an integer, please re-enter"
        fi      
}       
test304 $num1 $num2

 [root@cotenos day06]# bash test4.sh 
please input two number:12 45
12+45=57
12-45=-33
12*45=540
12/45=0
[root@cotenos day06]# 

 

5.将/etc/shadow文件的每一行作为元数赋值给数组

[root@cotenos day06]# vim test5.sh

#!/bin/bash
num=`wc -l </etc/shadow`
for i in `seq $num`
do      
         array[$i]=`head $i /etc/shadow | tail -l`
done     
for i in ${array[*]}
do
        echo $i
done    

6.使用关联数组统计文件/etc/passwd中用户使用的不同类型shell的数量

[root@cotenos day06]# vim test6.sh

#!/bin/bash
declare -A array
for i in `cut -d: -f 7 /etc/passwd`
do      
        let array[$i]++
done    
for i in ${!array[*]}
do
         echo " $i: ${array[$i]} "
done     
~             

7.使用关联数组按扩展名统计指定目录中文件的数量

[root@cotenos day06]# vim test7.sh

#!/bin/bash
read -p "pleace input filename:" filename
declare -A array
for i in `ls $filename | fgrep '.' | cut -d . -f 2`
do      
        let array[$i]++
done    
for i in ${!array[*]}
do
        echo "$i: ${array[$i]}"
done