Shell - Chapter 6 exercise

1、 Write function , Achieve green printing OK And red FAILED Determine whether there are parameters , Existence as Ok, There is no such thing as FAILED

[[email protected] zuoye]# vim 6.1.sh 
#!/bin/bash
sy() {
    
        if [ $# -eq 0 ];then
                echo -e "\033[32m FAILED \033[0m"
        else
                echo -e "\033[31m OK \033[0m" 
        fi

}
sy $1
~       

2、 Write function , To judge whether there is no position parameter , If there are no parameters , Prompt error

[[email protected] zuoye]# vim 6.2.sh 
#!/bin/bash
sy() {
    
        if [ $# -eq 0 ];then
                echo -e "\033[32m FAILED \033[0m"
        else
                echo -e "\033[31m OK \033[0m" 
        fi

}
sy $1

3、 Write a function to implement two numbers as parameters , Return maximum

[[email protected] zuoye]# vim 6.3.sh 

#!/bin/bash
sy() {
    
        if [ $1 -gt $2 ];then
                echo $1 
        else
                echo $2
        fi

}
read -p "please input two number:" num1 num2
sy $num1 $num2

4、 Write function , Implement two integer digit parameters , Calculate addition, subtraction, multiplication and division .

[[email protected] zuoye]# vim 6.4.sh 
#!/bin/bash
sy() {
    
        expr $1 + $2 + 10 &>/dev/null
        if [ $? -eq 0 ];then
                echo "$1+$2=$(($1+$2))"
                echo "$1-$2=$(($1-$2))"
                echo "$1*$2=$(($1*$2))"
                echo "$1/$2=$(($1/$2))"
        else
                echo "please input int number"
        fi
}
read -p "please input two number:" num1 num2
sy $num1 $num2

5、 take /etc/shadow Each line of the file is assigned to the array as a primitive

[[email protected] zuoye]# vim 6.5.sh 
#!/bin/bash
a=(`cat hostip`)
for((i=0;i<${
    #a[*]};i++))
do
        echo ${
    a[$i]}
done

6、 Use associative array statistics file /etc/passwd Different types used by users in shell The number of

#!/bin/bash
declare -A sy
        for i in `cut -d: -f7 /etc/passwd`
do
        let sy[$i]++
done
for i in ${
    !sy[*]}
do
        echo "$i ${sy[$i]}"
done

7、 Use the associative array to count the number of files in the specified directory by extension

[[email protected] zuoye]# vim 6.7.sh
#!/bin/bash
read -p "pash: " pash
declare -A sy
for i in ` ls |fgrep . |awk -F. {'print $NF'}`
do
        let sy[$i]++
done
for i in ${
    !sy[*]}
do  
                echo "$i ${sy[$i]}"
done