linuxexpert-practice-labs/labs/linux-plus/2-4-2-repositories-and-other-sources

Linux+ 2.4.2: Repositories and other sources

An extra repository, alternatives, a Python virtual environment, and building a small program from source.

Before you start

Work as root, so ~ is /root. The VM needs internet access. The lab sets the editor alternative to automatic mode (on Debian and Ubuntu) and checks that ~/venv and ~/src don't exist yet. Leave your work in place for grading.

Tasks

1. RHEL relatives: add the EPEL repository, enable the CRB repository, and install htop from EPEL.
2. Debian and Ubuntu: look at the APT sources and the alternatives for editor, then choose an editor yourself with update-alternatives --config editor.
3. See what pip3 install does outside a virtual environment, then create the virtual environment ~/venv and install requests into it.
4. In ~/src, write hi.c (a program that prints built) and a Makefile with a hi target that compiles it and an install target that copies it to /usr/local/bin/hi. Build it, install it, and run hi.

Hints

• dnf repolist --all, dnf install epel-release, dnf config-manager --set-enabled crb, dnf list --installed htop (the repo column).
• cat /etc/apt/sources.list.d/*.sources, update-alternatives --display editor.
• Ubuntu needs python3-venv (and python3-pip); python3 -m venv, ~/venv/bin/pip install, ~/venv/bin/pip list.
• gcc and make (build-essential on Ubuntu); Makefile recipe lines start with a tab.