website="www.test1.com www.test2.com www.test3.com";

for i in $website
do
 if [ ! -d ${back_log_dir}/${i} ]
 then
  mkdir ${back_log_dir}/${i}
 fi
done 

for i in $website
do
 if [ -s ${log_dir}/access_${i}.log ]
 then
  mv ${log_dir}/access_${i}.log ${back_log_dir}/${i}/access_${time}.log
 fi

 if [ -s ${log_dir}/error_${i}.log  ]
 then
  mv ${log_dir}/error_${i}.log ${back_log_dir}/${i}/error_${time}.log
 fi

done

kill -USR1 `cat  /usr/local/nginx/logs/nginx.pid`

for i in $website
do
 if [ -s ${back_log_dir}/${i}/access_${time}.log ]
 then
  xz  ${back_log_dir}/${i}/access_${time}.log
 fi

 if [ -s ${back_log_dir}/${i}/error_${time}.log ]
 then
  xz  ${back_log_dir}/${i}/error_${time}.log
 fi

done