Monster bash logrotate

logrotate.sh

#!/bin/bash
shopt -s extglob

PATTERN="my-app.log"
MAX=10

# move and recreate
DATE=$(date +"%Y-%m-%d")
LOGFILE=`ls ${PATTERN}`
LOGFILE_NEW="${LOGFILE}.${DATE}"
if [ ! -f "${LOGFILE_NEW}" ]; then
    mv "${LOGFILE}" "${LOGFILE_NEW}"
    touch "${LOGFILE}"
fi

# if more files found than maximum, delete the rest
PATTERN="${PATTERN}.+([0-9]|-)"
FILES=`ls $PATTERN`
FILES_ARR=($FILES)
test ${#FILES_ARR[@]} -gt ${MAX} && rm ${FILES#*${FILES_ARR[$(( $MAX - 1 ))]}}

# # classic logrotate
# for i in `seq $(( $MAX - 1 )) 1`; do
#     if test -f "${PATTERN}.$i"; then
#         j=$(( i + 1 ))
#         mv "${PATTERN}.$i" "${PATTERN}.$j"
#     fi
# done
# mv "${PATTERN}" "${PATTERN}.1"