retry bash function, copied from http://redd.it/25tgqg

retry bash function

retry(){
 # FROM http://redd.it/25tgqg
    local delay=1 n

    if ! [[ $1 = *[^0-9]* ]]; then
        if (($1 > 0)); then
            delay=$1
        fi
        shift
    fi

    # run command
    while ! "$@"; do
        echo "retrying in ${delay}s" >&2
        for ((n=delay; n>0; n--)); do
            sleep 1 || return
        done
    done
}