Shell Programming and Scripting

#!/bin/bash -x 
key_file=/temp/ukey.key 
device=da${1//[a-z]/} 
origin=/mnt/DATA/ 
target=/mnt/secret 
echo ${device} 
echo ${target} 
_start() { 
    if [ ! -f /var/run/${0##*/}.pid ];then 
        echo $$ > /var/run/${0##*/}.pid 
    else 
        /usr/bin/logger "Error syncing $origin on $device"; 
        echo "A16P16A16P16A16P16CP8CP8CP8A16P16A16P16A16" > /dev/ 
speaker 
        _finish; 
    fi 
} 

_finish() { 
    if [ -f /var/run/${0##*/}.pid ];then 
        rm /var/run/${0##*/}.pid; 
    fi 
    exit 
} 

_mount() { 
    /sbin/geli attach -p -k ${key_file} /dev/$device 
    /bin/mkdir -p ${target} && 
    /sbin/mount /dev/${device}.eli ${target}/ && 
    /sbin/fsck_ufs -pB ${target}; 
} 

_umount() { 
    /sbin/umount /dev/${device}.eli; 
    /bin/rm -r ${target}; 
    /bin/sync /dev/${device}.eli 
    /sbin/geli detach /dev/${device}; 
    /bin/sync /dev/${device} 
} 

_sync_func() { 
    /usr/local/bin/rsync -a --log-file=${origin}/backup.log ${origin}/ 
${target}/ 
    /usr/bin/logger "Finish syncing $origin on $device"; 
} 

_start; _mount; _sync_func; _umount; 
while [ -e /dev/da0 ];do echo "A8P8A8P8A8" > /dev/speaker;sleep 
10;done 
_finish;