smooth_del.sh

#!/bin/bash
set -e

function help() {
    cat << EOF >&2
Usage           : ./smooth_del.sh <dir> <ext> <day(s)> <quiet (optional)>

<dir>           : The path of directory eg. /var/log/something_log/
<ext>           : The extension of file to delete eg. jpg
<day(s)>        : Amount number of the day eg. 14 mean 2 weeks
--q <quiet>      : The script will work in quiet mode
EOF
    exit 1
}

function del() {
    # Temporary file to store file names
    NOW=$(date +"%m-%d-%Y")
    FILE_FILENAMES="/tmp/file_list_${NOW}"

    while true; do
        # Get all filename and directory then save in temporary text file
        find ${FOLDER} -type f -mtime +${OLDER} -name "${EXTENSION}" -ls | head -5000 | awk '{print $11}' > ${FILE_FILENAMES}

        # Count total file (from number of text line)
        COUNT_FILES=$(wc -l "${FILE_FILENAMES}" | awk '{print $1}')
        echo "The total file is ${COUNT_FILES}"
        # If text line more than 0

        if [[ ${COUNT_FILES} -gt 0 ]]; then
            printf "[%s] %s files found. going on with removing\n" "$(date)" "${COUNT_FILES}"
            if [[ -s ${FILE_FILENAMES} ]]; then
                while read FILE; do
                    echo "${FILE}"
                    rm "${FILE}"
                    sleep 1
                done < "${FILE_FILENAMES}"
            fi
        else
            printf "[%s] script has finished, almost all files have been deleted" "$(date)"
            break
        fi
        sleep 5
    done
}

# Check if user pass --help or empty argument
if [[ ${1} == "--help" ]] || [[ ${1} == "" ]]; then
    help
fi

# Define variable from argument
FOLDER=${1}
EXTENSION=${2}
OLDER=${3}
QUIET=${4}

# Test Directory
if [[ ! -z ${FOLDER} ]] && [[ ! ${FOLDER} =~ [\/]$ ]]; then
    FOLDER="${FOLDER}/"
elif [[ ! -z ${FOLDER} ]] && [[ ! -d ${FOLDER} ]]; then
    echo "The directory does not exist, Please check and try again."
    exit 1
fi

# Test Extension
if [[ ! -z ${EXTENSION} ]] && [[ ${EXTENSION} =~ ^[a-zA-Z0-9]+ ]]; then
    EXTENSION="*.${EXTENSION}"
else
    echo "The extension is invalid."
    exit 1
fi

# Test days
if [[ ! -z ${OLDER} ]] && [[ ! ${OLDER} =~ ^[0-9]+ ]]; then
    echo "The number of day(s) is invalid"
    exit 1
fi

# If quiet mode exist
if [[ ! -z ${QUIET} ]] && [[ ${QUIET} == "--q" ]]; then
    del
elif [[ -z ${QUIET} ]]; then
    read -p "You want to delete all ${EXTENSION} files that older than ${OLDER} day(s) in ${FOLDER}, Do you want to continue? (y/n)" QUESTION
    if [[ ${QUESTION} =~ ^([nN][oO]|[nN])+$ ]]; then
        echo "See ya!"
        exit 1
    elif [[ ${QUESTION} =~ ^([yY][eE][sS]|[yY])+$ ]]; then
        del
    fi
fi