备份shell脚本一例

    #!/bin/sh
    # backup_run

    # script to run the backups
    # loads in a setting file for the user to change

    SOURCE=/home/bob/backup.defaults
    check_source()
    {
        # check_source
        # can we load the file
        # backup.defaults is the source file containing config/functions
        # make sure your path includes this directory you are runing from
        if [ -r $SOURCE ];then
          . $SOURCE # load $source
        else
            echo "`basename $0`: cannot locate default file"
            exit 1
        fi
    }

    header()
    {
        # header
        USER=`whoami`
        MYDATE=`date +%A" "%e" of "%B-%Y`
        clear
        cat << HH
        User: $USER $MYDATE
                    NETWORK SYSTEM BACKUP
                    =====================
    HH
    }

    change_settings()
    {
        # change_settings
        # let the user see the default settings..
        header
        echo "Valid Entries Are..."
        echo "Tape Device: rmt0,rmt1,rmt3"
        echo "Mail Admin:yes,no"
        echo "Backup Type: full,normal,sybase "
        while :
        do
            echo -n -c "nn Tape Device To Be Used For This Backup [$_DEVICE] :"
            read T_DEVICE
            : ${T_DEVICE:=$_DEVICE}
            case $T_DEVICE in
                rmt0|rmt1|rmt3) break
                    ;;
                *) echo "The device are either...rmt0,rmt1,rmt3"
                    ;;
            esac
        done

        # if the user hits return on any of the fields, the default value will be used
        while :
        do
            echo -n "Mail Admin When Done [$_INFORM] : "
            read T_INFORM
            : ${T_INFORM:=$_INFORM}
            case $T_INFORM in
                yes|Yes) break
                    ;;
                no|No) break
                    ;;
                *) echo "The choices are yes,no"
                    ;;
            esac
        done

        while :
        do
            echo -n "Backup Type [$_TYPE] :"
            read T_TYPE
            : ${T_TYPE:=$_TYPE}
            case $T_TYPE in
                Full|full) break
                    ;;
                Normal|normal) break
                    ;;
                Sybase|sybase) break
                    ;;
                *) echo "The choices are either ... full,normal,sybase"
            esac
        done

        # re-assign the temp varialbes back to original variables that
        # were loaded in
        _DEVICE=$T_DEVICE;_INFORM=$T_INFORM;_TYPE=$T_TYPE
    }

    show_settings()
    {
        # display current settings
        cat << HH
                    Default Settings Are...
                Tape Device To Be Used : $_DEVICE
                Mail Admin When Done : $_INFORM
                Type Of Backup : $_TYPE
                Log File Of Backup : $_LOGFILE
    HH

    }

    get_code()
    {
        # users get 3 attempts at entering the correct code
        # _CODE is loaded in from the source file
        clear
        header
        _COUNTER=0
        echo "YOU MUST ENTER THE CORRECT CODE TO BE ABLE TO CHANGE DEFAULT SETTINGS"
        while :
        do
            _COUNTER=`expr $_COUNTER + 1`
            echo -n "Enter the code to change the settings: "
            read T_CODE
            # echo $_COUNTER
            if [ "$T_CODE" = "$_CODE" ];then
                return 0
            else
                if [ "$_COUNTER" -gt 3 ];then
                    echo "Sorry incorrect code entered, you cannot change the settings..."
                    return 1
                fi
            fi
        done
    }

    check_drive()
    {
        # make sure we can rewind the tape
        mt -f /dev/$_DEVICE rewind > /dev/null 2>&1
        if [ $? -ne 0 ];then
            return 1
        else
            return 0
        fi
    }

    #====================== main =======================

    # can we source the file
    check_source
    header
    # display the loaded in variables
    show_settings

    # ask user if he/she wants to change any settings
    if continue_prompt "Do you wish To Change Some of The System Defaults" "Y";
    then
        echo $?   
        # yes then enter code name
        if get_code;then
            # change some settings
            change_settings
        fi
    fi

    #------------------ got settings... now do backup
    if check_drive;then
        echo "tape OK..."
    else
        echo "Cannot rewind the tape..Is it in the tape drive???"
        echo "check it out"
        exit 1
    fi

    # file system paths to backup
    case $_TYPE in
        Full|full)
            BACKUP_PATH="sybase syb/suppor etc var bin apps usr/local"
            ;;
        Normal|normal)
            BACKUP_PATH="etc var bin apps usr/local"
            ;;
        Sybase|sybase)
            BACKUP_PATH="sybase syb/suppor"
            ;;
    esac
    # now for backup
    cd /
    echo "Now starting backup......"
    find $BACKUP_PATH -print | cpio -ovB -O /dev/$_DEVICE >> $_LOGFILE 2>&1

    # if the above cpio does not work on your system try cpio below, instead
    # find $BACKUP_PATH -print | cpio -ovB > /dev/$_DEVICE >> $_LOGFILE 2>&1
    # to get more information on the tape change -ovB to -ovcC66536

    if [ "$_INFORM" = "yes" ];then
        echo "Backup finished check the log file" | mail admin
    fi

    #!/bin/sh
    # backup.defaults
    # configuration default file for network backups
    # edit this file at your own
    # name backup.defaults
    # --------------------------------------------
    # not necessary for the environments to be in quotes.. but
    _CODE="comet"
    _LOGFILE="/appdva/backup/log.`date +%y%m%d`"
    _DEVICE="rmt0"
    _INFORM="yes"
    _TYPE="Full"
    #---------------------------------------------
    continue_prompt()
    {
        # continue_prompt
        # to call: continue_prompt "string to display" default_answer
        _STR=$1
        _DEFAULT=$2
        # check we have the right params
        if [ $# -lt 1 ];then
            echo "continue_prompt: I need a string to display"
            return 1
        fi
        while :
        do
            echo -n "$_STR [Y..N] [$_DEFAULT]:"
            read _ANS
            if [ "$_ANS" = "" ];then
                : ${_ANS:=$_DEFAULT}
                case $_ANS in
                    Y) return 0
                        ;;
                    N) return 1
                        ;;
                esac
            fi
            # user has selected something
            case $_ANS in
                y|Y|Yes|YES)
                    return 0
                    ;;
                n|N|No|NO)
                    return 1
                    ;;
                *) echo "Answer either Y or N, default is $_DEFAULT"
                    ;;
            esac
            echo $_ANS
        done
    }

$./backup_run.sh backup.defaults