脚本添加scp计划任务用以实现简单数据备份

#!/bin/bash

###############################################################################
#    This script is used to generate backup crontab tasks. Please ensure that #
#  the backup node can access remote resources without password via SSH.      #
#    This script can also create a daily backup management crontab task, and  #
#  do the daily backup management.                                            #
#    The current running user is 'root', the backup directory is '/backup',   #
#  the script location is '/root', and the backup running time is a random    #
# time point  at 0-3 o'clock every day. You can modify these configurations   #
# if necessary.                                                               #
#    -- Programmed by WangXiaoLei on 17/02/2022                               #
###############################################################################

randNumHour=$(($RANDOM%3))
randNumMinute=$(($RANDOM%60))
user=root
backupdir="/backup"
scriptLocation="/root"

if [[ ${1%*/} == ${1:0:-1}  ]]
then
        remoteHost=`echo ${1%*/} | awk -F '@|:' '{print $2}'`
        remoteHostPath=`echo ${1%*/} | awk -F ':' '{print $2}'`
else
        remoteHost=`echo $1 | awk -F '@|:' '{print $2}'`
        remoteHostPath=`echo $1 | awk -F ':' '{print $2}'`
fi
if [[ $1 == *"@"*":"* ]]
then
        remoteHostFolder=${remoteHostPath%*`echo $remoteHostPath | awk -F '/' '{print $NF}'`}
        if ping -c 1 $remoteHost >/dev/null
        then
                if ssh `echo $1 | awk -F ':' '{print $1}'` "ls -l $remoteHostPath"
                then
                        if crontab -l  | grep $remoteHost | grep $remoteHostPath
                        then
                                echo -e "\033[31mThis crontab already exists!\033[0m"
                        fi
                        while true
                        do
                                read -r -p "Are You Sure Add crontab? [Y/n] " input
                                case $input in
                                     [yY][eE][sS]|[yY])
                                          mkdir -p $backupdir/$remoteHost$remoteHostFolder
                                          echo $randNumMinute" "$randNumHour" * * * /usr/bin/scp -r $1 $backupdir/$remoteHost$remoteHostFolder" >> /var/spool/cron/$user
                                          chmod 600 /var/spool/cron/$user
                                          crontab /var/spool/cron/$user
                                          /bin/systemctl restart crond.service
                                          exit 1
                                          ;;

                                     [nN][oO]|[nN])
                                          exit 1
                                          ;;

                                     *)
                                          echo "Invalid input..."
                                          ;;
                                esac
                        done
                else
                        echo -e "\033[31m$1 backup resource can not be found!\033[0m"
                fi
        else
                echo -e "\033[31m$remoteHost is unreachable!\033[0m"
        fi
elif [[ $1 == "SetDailyCleaning" ]]
then
        if crontab -l  | grep "DoDailyCleaning"
        then
                echo -e "\033[31mThis crontab already exists!\033[0m"
        fi
        while true
        do
                read -r -p "Are You Sure Add crontab? [Y/n] " input
                case $input in
                     [yY][eE][sS]|[yY])
                          echo "50 23 * * * /bin/bash $scriptLocation/SetBackupCrond.sh DoDailyCleaning >/dev/null 2>&1" >> /var/spool/cron/$user
                          chmod 600 /var/spool/cron/$user
                          crontab /var/spool/cron/$user
                          /bin/systemctl restart crond.service
                          exit 1
                          ;;

                     [nN][oO]|[nN])
                          exit 1
                          ;;

                     *)
                          echo "Invalid input..."
                          ;;
                esac
        done

elif [[ $1 == "DoDailyCleaning" ]]
then
        if [ -d "$backupdir-2d" ]
        then rm -rf $backupdir-2d >/dev/null
        fi

        if [ -d "$backupdir-1d" ]
        then mv $backupdir-1d $backupdir-2d > /dev/null
        fi

        if [ -d "$backupdir" ]
        then mv $backupdir $backupdir-1d >/dev/null
        fi

        for line1 in `cat "/var/spool/cron/$user" | grep "/usr/bin/scp" | awk '{print $9}'`; do mkdir -p $line1
        done
else
        echo "Usage: ./SetBackupCrond.sh  or ./SetBackupCrond.sh SetDailyCleaning"
fi