dockerfile.run

rwall

Send a message to users logged on a host

Debian

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

Ubuntu

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

Kali Linux

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

Fedora

RUN dnf install -y rwall

Raspbian

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

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