archive everyday maillog or multi website logs to every file. origin from solaris rotate script.

rotateMailLog.sh

#! /bin/sh
# in crontab:
# 59 23 * * *   /home/user/bin/rotateMailLog.sh
# save one or many logs in one folder to other folder
LOGDIR=/var/log
if test -d $LOGDIR
then
  cd $LOGDIR
  for LOG in maillog messages.log
  do
  if test -s $LOG
  then
    test -f $LOG && mv $LOG  /home/LOG/$LOG.`date +%Y%m%d`
    cp /dev/null $LOG
    chmod 644  $LOG
  fi
  done
fi
#kill -HUP `cat /var/run/syslogd.pid`
/bin/systemctl restart rsyslog

rotateMultiWebLogs.sh

#! /bin/sh
# 58 23 * * *   /home/bin/rotateMultiWebLogs.sh
# https://opensource.com/article/18/5/you-dont-know-bash-intro-bash-arrays[Introduction to Bash arrays | Opensource.com]

# define multi websites folders paths and log names, one by one
LOGDIR=(/var/logs/web1 /var/logs/web2)
LOGNAME=(access.log access.log)

# test parameters
fake_rotate(){
  echo DIR: ${LOGDIR[$1]} LOGNAME: ${LOGNAME[$1]}
}

do_rotate(){
  if test -d ${LOGDIR[$1]}
  then
    cd ${LOGDIR[$1]}
    if test -s ${LOGNAME[$1]}
    then
      #test -f $LOG && mv $LOG  /home/rtfm/LOG/$LOG.`date +%Y%m%d`
      test -f ${LOGNAME[$1]}  && mv ${LOGNAME[$1]} ${LOGNAME[$1]}.`date +%Y%m%d`
      cp /dev/null ${LOGDIR[$1]}/${LOGNAME[$1]}
      chmod 644 ${LOGDIR[$1]}/${LOGNAME[$1]}
    fi
  else
    echo no ${LOGDIR[$1]}
  fi
}

for logdir in ${!LOGDIR[@]}
do
  do_rotate $logdir
done

#kill -HUP `cat /var/run/nginx.pid`
/bin/systemctl restart nginx