备份shell脚本实例代码

1、backup_run.sh

    #!/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 $mydate
                    network system backup
                    =====================
    hh
    }
    change_settings()
    {
        # change_settings
        # let the user see the default settings..
        header
        echo "valid entries are..."
        echo "tape device: rmt0,rmt1,rmt3"
        echo "mail admin:yes,no"
        echo "backup type: full,normal,sybase "
        while :
        do
            echo -n -c "\n\n tape device to be used for this backup [$_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

2、backup.defaults

    #!/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
    }

3、运行：

$./backup_run.sh backup.defaults