shell脚本函数练习

1.实现：执行脚本输入用户名，若该用户存在，输出提示该用户已存在；若该用户不存在，提示用户输入密码，建立用户并设立其密码

#!/bin/bash
RED ()
{
        echo -e "\033[31m$*\033[0m"
}

USERADD()
{
        read -p "Please input username: " USERNAME
        [ "$USERNAME" = "exit" ] && {
        echo bye
        exit 0
}
        useradd $USERNAME &> /dev/null
        [ `echo $?` = "0" ] && {
        read -p "Please input passwd: " PASSWD
        echo $PASSWD | passwd --stdin $USERNAME &> /dev/null
}||{
        RED "$USERNAME  is exist!"
}
        USERADD
}
USERADD

2.实现：简单的秒倒计时

#!/bin/bash
        for SEC  in {10..0}
        do
                 echo   "After ${SEC}s is end"  ##-n 循环输出显示在1行  
                 echo   -ne   "\r"   #覆盖之前的输出
                 sleep 1           #等待1秒再执行
        done
~

3.实现：分秒倒计时(循环方法)

#!/bin/bash
SEC=10
MIN=1
for((SEC=10;SEC>=0;SEC--))
do
        while [ "$SEC" = "0" -a "$MIN" = "0" ]
        do
                exit 0
        done

        while [ "$SEC" = "0" ]
        do
                echo  -ne  "After $MIN:$SEC is end! "    
                echo -ne "\r"     
                sleep 1
                SEC=59
                ((MIN--))
        done
        echo  -ne "After $MIN:$SEC is end!!"
        echo -ne "\r"
        sleep 1
done
~

4.实现倒计时器：1分10秒（计算方法）

#!/bin/bash
SEC=10
MIN=1
ALL_SEC=$[60*$MIN+$SEC]
for ((;ALL_SEC>0;ALL_SEC--))
do	SEC=$[$ALL_SEC%60]
	MIN=$[$ALL_SEC/60]
	echo -ne "After $MIN:$SEC is end!"
	echo -ne "\r"
	sleep 1
done

5.实现：检测指定范围主机是否通信，并将通信的主机ip输出到文件host_ip中

#!/bin/bash
##首先检测host_ip文件是否存在，如果存在将主动权交给用户，这才是体现服务逻辑所在！
[ -e "/mnt/host_ip" ] && {
        echo   "/mnt/host_ip is exist!"
        echo  "[O]verwrite [B]ackup [S]kip"
        read -p "What do you want action: " WORD
        ACTION=`echo $WORD | tr 'a-z' 'A-Z'`
        [ "$ACITON" = "O" ] && {
                rm -fr /mnt/host_ip
        }
        [ "$ACTION" = "B" ] && {
                mv /mnt/host_ip /mnt/host_ip.bak
        }
        [ "$ACTION" = "S" ] && {
                exit 0
        }
}
for ip in {10..20}
do      ping -c1 -w1 172.25.254.$ip &> /dev/null  && {
        echo "172.25.254.$ip" >> /mnt/host_ip
}
done

6.实现：简易计算器

#!/bin/bash
jisuan()
{
read -p "Please input first digit: " FIRST
[ -z "$FIRST" ] && {
		echo -e "\033[31mError:Please input digit!\033[0m" 
		exit 1
	}
read -p "PLease input action for digit: " ACTION
[ -z "$ACTION" ] && { 
		echo -e "\033[31mErro:Please input action!\033[0m"
		exit 3
	}
read -p "Please input second digit: " SECOND
[ -z "$SECOND" ] && { 
		echo -e "\033[31mErro:Please input digit!\033[0m"
		exit 2
	}
bc<<EOF
$FIRST $ACTION $SECOND
EOF
jisuan
}
jisuan

7.实现：执行users_create.sh userlist passlist 如果userlist 与 passlist 行数不相等报错；两文件不存在报错；用户以存在报错；当用户不存在建立用户并为其设置密码

#!/bin/bash
RED()
{
        echo -e "\033[31m$*\033[0m"
}
GREEN()
{
        echo -e "\033[32m$*\033[0m"
}

if [ "$#" -lt "2" ]
then    RED "Please input your userlist and passlist following $0!!!"
elif [ ! -e "$1" ]
then    RED "$1  is not exist!!!Please check!"
elif [ ! -e "$2" ]
then    RED "$2  is not exist!!!Please check!"
else [ -e "$1" -a -e "$2" ]
        USERNUM=`awk 'BEGIN{N=0}{N++}END{print N}' $1`
        PASSNUM=`awk 'BEGIN{M=0}{M++}END{print M}' $2`
        [ "$USERNUM" != "$PASSNUM" ]  && {
        RED "Please check your userlist and passlist!!!"
        }
        for NUM in `seq 1 $USERNUM`
        do
                   USERNAME=`sed -n ${NUM}p $1`
                PASS=`sed -n ${NUM}p $2`
                useradd $USERNAME && {
                        echo $PASS | passwd --stdin $USERNAME
                        GREEN "$USERNAME created successful!"
                }||{
                        RED "$USERNAME is already exist!!!"
                }
        done
        fi

8.实现：远程连接1-10主机，并且为每个主机分别建立userfile中的用户，如果主机中用户以存在，则不做任何操作；如若不存在，建立用户，并为用户修改密码

#!/bin/bash
Auth_Conenct()
{
/usr/bin/expect <<EOF
spawn ssh [email protected]$1 
expect {
"yes/no" { send "yes\r";exp_continue }
"password:" { send "westos\r" }
}
expect eof
EOF
}

Max_Line=`awk 'BEGIN{N=0}{N++}END{print N}' $1`

for NUM in {1..10}
do
	ping -c1 -w1 172.25.254.$NUM &> /dev/null
	if [ "$?" = "0" ]
	then
	for Line_Num in `seq 1 $Max_Line`
	do
		USERNAME=`sed -n ${Line_Num}p $1`
		PASSWORD=`sed -n ${Line_Num}p $2`
		Auto_Connect 172.25.254.$NUM "id $USERNAME &> /dev/null||useradd $USERNAME && echo $PASSWORD | passwd --stdin $USERNAME" &> /dev/null
	fi
done

10.实现：文件类型的判定

#!/bin/bash
while [ `echo $?` = 0 ]
do      read -p "Please input your filename: " WORDS
        WORD = `echo $WORDS` | tr 'A-Z' 'a-z'
        if [ -d "$WORD" ]
        then    echo -e "\033[32m$WORD is a direcotry!\033[0m"
        elif [ -f "$WORD" ]
        then    echo -e "\033[32m$WORD is a common file!\033[0m"        
        elif [ -L "$WORD" ]
        then    echo -e "\033[32m$WORD is a soft file!\033[0m"
        elif [ "$WORD" = "exit" ]
        then    echo "Bye~~~"
                exit 1
        else
                echo -e "\033[31m$WORD is not exist!\033[0m"
        fi
done

11.实现文件类型的判定（case）

#!/bin/bash
CHECK_FILE()
{
        if [ -e "$1" ]
        then  $2
              $3
        fi
}
GREEN()
{
        echo -e "\033[32m$*\033[0m"
}
RED()
{
        echo -e "\033[31m$*\033[0m"
}
[ "$#" -ge "2" ] && {
        case $1 in
                -a)
                CHECK_FILE $2 " RED  $2 is exist!" exit
                touch $2
                GREEN "$2 is already create!"
                ;;
                -d)
 CHECK_FILE $2 "rm -fr $2;GREEN $2 is already delete! " exit
                RED "$2 is not exist!"
                ;;
                -p)
                CHECK_FILE $2 "cp -rp $2 /mnt" exit
                RED "$2 is not exist!"
                ;;
                *)
                RED "Please input -a|-d|-p following $0!"
        esac
}||{
        RED   "Please input option and filename!"
}

12.实现：数据库的备份（有不足）

#!/bin/bash
RED()
{
        echo -e "\033[31m$*\033[0m"
}
GREEN()
{
        echo -e "\033[32m$*\033[0m"
}
[ -z "$1" ]&& {
        RED "Error:Please input password for mysql!"
        exit 0
}

[ -d "/mnt/mysqldump" ] &> /dev/null &&{
        RED "Error:/mnt/mysqldump is already exist!!!"
        GREEN "[S]kip [B]ackup [O]verwrite"
        read -p "Please input your action for /mnt/mysqldump: " WORD
        ACTION=`echo $WORD| tr 'a-z' 'A-Z'`
        [ "$ACTION" = "S" ] && {
                exit 0
        }
        [ "$ACTION" = "B" ] && {
                mv /mnt/mysqldump /mnt/mysqldump.backsql
                                                        
        }
        [ "$ACTION" = "O" ] && {
                rm -fr /mnt/mysqldump
        }

}
NUM=`mysql -uroot -p$1 -e "SHOW DATABASES;"|awk 'BEGIN{N=0}{N++}END{print N}'`

for M in `seq 3 $[$NUM-1]`
do
        DATABASE=`mysql -uroot -p$1 -e "SHOW DATABASES;"|sed -n ${M}p`
        mkdir /mnt/mysqldump
        touch /mnt/mysqldump/$DATABASE
        `mysqldump -uroot -p$1 $DATABASE > /mnt/mysqldump/$DATABASE`
done

13.实现：-d 用户的删除 -c用户密码的改变

#!/bin/bash
    [ -z "$1" ]&&{
            echo -e "\033[31mError:Please input your options!!\033[0m"
            exit 0
    }
    [ "$1" = "-d" ]&&{
            read -p "Please input username: " NAME
            userdel -r $NAME
            echo -e "\033[31m$NAME is already del!\033[0m"          
            exit 0
    }
    [ "$1" = "-c" ]&&{
            read -p "Please input username: " NAME1
            read -p "Please input password: " -s  PASSWD
            echo $PASSWD | passwd --stdin $NAME1
            exit 0
    }
    [ "$1" = "-d " ] -o [ "$1" = "-c" ] ||{
            echo -e "\033[31mPlease input -d|-c following userctrl.sh\033[0m"
            exit 0
    }

14.实现：一键搭建论坛

#!/bin/bash
echo "install software..."
yum install httpd mariadb-server php php-mysql -y
sed '/^Listen 80/cListen 8080' -i /etc/httpd/conf/httpd.conf
sed '1askip-networking=1' -i /etc/my.cnf
systemctl start  mariadb httpd
firewall-cmd --permanent --add-port=8080/tcp
firewall-cmd --reload
mysql_secure_installation <<EOF



westos
westos




EOF
wget ftp://172.25.254.250/pub/Discuz_x3.2_SC_UTF8.zip -O /var/www/html/Discuz_X3.2_SC_UTF8.zip
cd /var/www/html
unzip Discuz_X3.2_SC_UTF8.zip &> /dev/null
chmod o+w  upload/ -R
setenforce 0
firefox http://localhost:8080/upload

shell脚本函数练习

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