脚本日志记录

function log() {
        echo >&2 -e "[$(date +"%Y-%m-%d %H:%M:%S")] ${1-}"
}

function die() {
        local msg=$1
        local code=${2-1} # Bash parameter expansion - default exit status 1. See https://wiki.bash-hackers.org/syntax/pe#use_a_default_value
        log "$msg"
        exit "$code"
}