#!/bin/bash
# set -x 

log() {
    local log_file=/var/log/update_controller.log
    if [ -f "$log_file" ]; then
        touch $log_file
    fi
    if [ $(wc -l < $log_file) > 100000 ]; then
        # remove first line
        sed -e 1d -i $log_file
    fi
    message="$(date +'%D_%T'): $*"
    printf "$message\n"
    printf "$message\n" >> $log_file
}
# log "test message1" "test message2"