第四天作业

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

echo -e "\033[32m OK \033[0m"
echo -e "\033[31m Failed \033[0m"
vim 1.sh
#!/bin/bash
fun (){
    
        if [ $# -eq 0 ]
        then
                echo "Failed"
        else
                echo "OK"
        fi

}
read -p "please input :" i
fun $i
chmod a+x 1.sh
bash 1.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

vim 2.sh
#!/bin/bash
fun (){
    
        if [ $# -ne 0 ]
        then
                echo " parameters exist"
        else
                echo "error"
        fi

}
read -p "please input parameter:" i
fun $i
chmod a+x 2.sh
bash 2.sh

3、编写函数实现两个数字做为参数，返回最大值

vim 3.sh
#!/bin/bash
read -p "please input two number:" num1 num2
fun (){
    
        if [ $num1 -gt $num2 ]
        then
                echo "max is $num1"
        elif [ $num1 -lt $num2 ]
        then
                echo "max is $num2"
        else
                echo "the number are equal"
        fi
}
fun $num1 $num2
chmod a+x 3.sh
bash 3.sh

4、编写函数，实现两个整数位参数，计算加减乘除。

vim 4.sh
#!/bin/bash
read -p "please input two number:" num1 num2
fun (){
    
        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

}
fun $num1 $num2
chmod a+x 4.sh
bash 4.sh

5、将/etc/shadow文件的每一行作为元数赋值给数组

vim 5.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
chmod a+x 5.sh
bash 5.sh

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

vim 6.sh
#!/bin/bash
declare -A array
for i in `cut -d: -f 7 /etc/passwd`
do
        let array[$i]++
done
#echo ${array[*]}
#echo ${!array[*]}
for i in ${
    !array[*]}
do
        echo "$i: ${array[$i]}"
done

chmod a+x 6.sh
bash 6.sh

7、使用关联数组按扩展名统计指定目录中文件的数量

vim 7.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
chmod a+x 7.sh
bash 7.sh