dockerfile.run

rclock

VT102 terminal emulator for the X Window System

Debian

RUN apt-get update && \
    apt-get install -y rxvt

Ubuntu

RUN apt-get update && \
    apt-get install -y rxvt

Kali Linux

RUN apt-get update && \
    apt-get install -y rxvt

Fedora

RUN dnf install -y rxvt

Raspbian

RUN apt-get update && \
    apt-get install -y rxvt

click the source code to copy install rclock on any operating system with command-not-found.com