Count the number of ip requests in a nginx log.By default it greps an entire log, or you can use regex filtering for specific requests or timeframe

count_ip.sh

function count_ip() {
    log_file=$1
    pattern=$2
    helper_file="/tmp/helperip"

    if [[ $# -eq 0 ]]; then
        echo "Usage: $FUNCNAME <log file> [pattern]"
        return
    fi
 
    if [[ ! -a $log_file ]]; then
        echo "$log_file doesn't exist"
        return
    fi

    if [[ -z $pattern ]]; then
        helper_file=$log_file
    else
        egrep "$pattern" $log_file > $helper_file
    fi

    awk '! /^-/ { print $1 }' $helper_file | tr -d , | sort | uniq -c | sort -k1,1nr -t. -k2,2n -k3,3n -k4,4n -k5,5n | head

    if [[ ! -z $pattern ]]; then
        rm -f $helper_file
    fi
}