dockerfile.run

export

Export shell variables to child processes. More information: <https://manned.org/export.1posix>.

Debian

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

Ubuntu

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

Alpine

RUN apk add execline

Kali Linux

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

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