dockerfile.run –

_guard-core

modifications

Debian

RUN apt-get update && \
    apt-get install -y ruby-guard

Ubuntu

RUN apt-get update && \
    apt-get install -y ruby-guard

Kali Linux

RUN apt-get update && \
    apt-get install -y ruby-guard

Fedora

RUN dnf install -y rubygem-guard

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