Published: 3/15/2026

RH134 — Shell scripts and command line

Shell environment, simple Bash scripts, loops, conditionals, and chapter 1 lab.

Goal

Document chapter 1 of RH134 v10.0 while studying it: strengthen the command line and automate tasks with Bash scripts on RHEL.

Section	Topic
1.1	Modifying the shell environment
1.2	Guided exercise: modifying the shell environment
1.3	Writing simple Bash scripts
1.4	Guided exercise: writing simple Bash scripts
1.5	Running loops and conditional commands
1.6	Guided exercise: loops and conditional commands
1.7	Lab: shell scripts and command line
1.8	Summary

Environment variables, export, and profile files (~/.bashrc, /etc/profile.d/).
Scripts with shebang, execute permissions, and positional arguments ($1, $@).
if / elif / else, for, while, and case structures.
Running everything in the ROL lab without a separate local environment.

chmod +x script.sh
./script.sh arg1 arg2
export VAR=value
source ~/.bashrc

(Fill in after lab 1.7: scripts used, syntax errors, and how they were fixed.)

Finish chapter 1 lab on ROL and paste the concrete steps here when the chapter is done.