Log Rotation

#!/bin/bash
# Author: Travis Tran
# Email: [email protected]
# Page: https://travistran.me/log-rotation-416/
# Path for message log
ACTION_LOG=/home/admin/action.log
# Path to log directory (must have / trail)
LOG_DIR=/home/admin/log_kpi/
# Number of daily log you want to keep from now
OFFSET=7
# Prefix of log file name
LOG_NAME_PREFIX=kpifull_
# Date pattern of log file name
LOG_NAME_DATE_PATTERN=%Y-%m-%d
# Suffix of log file name
LOG_NAME_SUFFIX=.log

# START
echo $(date +"%Y-%m-%d %H:%M:%S") "----------------------------" >> $ACTION_LOG
echo $(date +"%Y-%m-%d %H:%M:%S") "Start LogRotation..." >> $ACTION_LOG
for file in $(find $LOG_DIR -maxdepth 1 -name "$LOG_NAME_PREFIX*"); do
echo $(date +"%Y-%m-%d %H:%M:%S") "Checking file: $file" >> $ACTION_LOG
valid=0
for ((i = 0; i <= $OFFSET; i++)); do
dateStr=$(date --date="$i days ago" +"$LOG_NAME_DATE_PATTERN")
logByDate="$LOG_DIR$LOG_NAME_PREFIX$dateStr$LOG_NAME_SUFFIX"
if [ "$file" = "$logByDate" ]; then
if [ $i = 0 ]; then
valid=-1
echo $(date +"%Y-%m-%d %H:%M:%S") "This file is current log." >> $ACTION_LOG
else
valid=1
fi
break
elif [ "$file" = "$logByDate.zip" ]; then
valid=2
echo $(date +"%Y-%m-%d %H:%M:%S") "This file ALREADY be zipped." >> $ACTION_LOG
break
fi done
if [ $valid = -1 ]; then
continue
elif [ $valid = 2 ]; then
continue
elif [ $valid = 0 ]; then
echo $(date +"%Y-%m-%d %H:%M:%S") "This file is NOT in rotation range." >> $ACTION_LOG
rm -f "$file";
echo $(date +"%Y-%m-%d %H:%M:%S") "Deleted." >> $ACTION_LOG
else
echo $(date +"%Y-%m-%d %H:%M:%S") "This file is IN rotation range." >> $ACTION_LOG
zip -q "$file.zip" "$file"
echo $(date +"%Y-%m-%d %H:%M:%S") "Zipped." >> $ACTION_LOG
rm -f "$file";
echo $(date +"%Y-%m-%d %H:%M:%S") "Original log file removed." >> $ACTION_LOG
fi done
echo $(date +"%Y-%m-%d %H:%M:%S") "End LogRotation!!!" >> $ACTION_LOG