Are there any set of good practice assignments out there for learning bash

Title, thought of this when going through a bash course on YouTube. Edit: something for sed/awk will be useful as well

https://redd.it/1psquhh
@r_bash

Just discovered per-directory history. What else exists?

I came across this project: https://github.com/martinec/bash-per-directory-history

It's not seen much activity over the years and I can think of a few things for improvement. Just wanted to know if any knows of any alternatives that is more maintained before I start modifying this.

Meanwhile, what other cool stuff like this exists for bash?

https://redd.it/1psvweu
@r_bash

Methods to consider aborting everything if one of the steps below fails?

#!/usr/bin/env bash

docker network create "network.development.ch_api"
docker volume create "redis_certs.development.ch_api"

docker build \
    --file "${PWD}/docker/development/caddy_server/Dockerfile" \
    --tag "caddy_server.development.ch_api" \
    --quiet .
docker build \
    --file "${PWD}/docker/development/express_server/Dockerfile" \
    --tag "express_server.development.ch_api" \
    --quiet .
docker build \
    --file "${PWD}/docker/development/postgres_server/Dockerfile" \
    --tag "postgres_server.development.ch_api" \
    --quiet .
docker build \
    --file "${PWD}/docker/development/redis_certs/Dockerfile" \
    --tag "redis_certs.development.ch_api" \
    --quiet .
docker build \
    --file "${PWD}/docker/development/redis_server/Dockerfile" \
    --tag "redis_server.development.ch_api" \
    --quiet .

docker run \
    --detach \
    --env-file "${PWD}/docker/development/.env" \
    --interactive \
    --name "redis_certs.development.ch_api" \
    --network "network.development.ch_api" \
    --tty \
    --volume "redis_certs.development.ch_api:/home/tests/tls:rw" \
    "redis_certs.development.ch_api"

docker container wait "redis_certs.development.ch_api"

docker cp "redis_certs.development.ch_api:/home/tests/tls/ca.crt" "${PWD}/certs/docker/development/redis/ca.crt"

docker cp "redis_certs.development.ch_api:/home/tests/tls/client.crt" "${PWD}/certs/docker/development/redis/client.crt"

docker cp "redis_certs.development.ch_api:/home/tests/tls/client.key" "${PWD}/certs/docker/development/redis/client.key"

docker run \
    --detach \
    --env-file "${PWD}/docker/development/.env" \
    --interactive \
    --name "redis_server.development.ch_api" \
    --network "network.development.ch_api" \
    --publish 41729:41729  \
    --restart unless-stopped \
    --tty  \
    --volume "redis_certs.development.ch_api:/etc/ssl/certs:ro" \
    "redis_server.development.ch_api"

docker run \
    --detach \
    --env-file "${PWD}/docker/development/.env" \
    --interactive \
    --name "postgres_server.development.ch_api" \
    --network "network.development.ch_api" \
    --publish 47293:47293  \
    --restart unless-stopped \
    --tty \
    "postgres_server.development.ch_api"

docker run \
    --detach \
    --env-file "${PWD}/docker/development/.env" \
    --interactive \
    --name "express_server.development.ch_api" \
    --network "network.development.ch_api" \
    --publish 34273:34273 \
    --restart unless-stopped \
    --tty \
    --volume "redis_certs.development.ch_api:/home/node/ch_api/certs/docker/development/redis:ro" \
    "express_server.development.ch_api"

docker run \
    --detach \
    --env-file "${PWD}/docker/development/.env" \
    --interactive \
    --name "caddy_server.development.ch_api" \
    --network "network.development.ch_api" \
    --publish 80:80 \
    --publish 443:443 \
    --restart unless-stopped \
    --tty \
    "caddy_server.development.ch_api"

- Take a look at this noscript above
- It creates a docker network and a volume
- Then it builds a few images
- Then runs a container to generate certs
- Copy certs back to local machine and then runs a few other containers dependend on the above one
- Let us say that one of these steps fail. Now obviously if the network exists or volume does or even the image exists or if you attempt running the container with the same name twice, it is most certainly going to fail
- Let us say you want to abort everything and undo whatever was done if one of the steps fail
- Let's talk about the methods to handle such a case

# Put an if statement on every command

if docker run .... then
  success
else
  abort
fi

- This does the job but is going to look very ugly for like 25 invocations above

# Set -Euox pipefail

- I was warned somewhere that you should not do this because it causes unpredictable behavior

## Questions

- What are my options here?
- If someone presses Ctrl + C in the

middle of these commands, how do I rollback?



https://redd.it/1pswbva
@r_bash

Live football/soccer updates on your terminal
https://redd.it/1pucvqr
@r_bash

Bring Oh My Bash and all you need wherever you go through the ssh
https://i.imgur.com/2HbQebm.png

https://redd.it/1ptmj2j
@r_bash

Understanding Linux Networking Commands by Learning Their Limits

While learning Linux networking, I realized I often knew what command to run but not what its output can’t tell me.

So I started documenting commands along with their limitations:

ss / netstat → shows listening sockets, not firewall behavior
ip → shows configuration, not end-to-end reachability
ping → ICMP-based, not real traffic
traceroute/mtr → path info can be incomplete
dig/nslookup → DNS only, not service health
nc → basic port checks, limited context
curl → app-layer view, not network internals

This way of learning has helped me interpret outputs more carefully instead of assuming “network issue” too quickly.

I’ve written a blog focused only on how these commands work and their limitations, mainly as learning notes. I’ll add the link in comments for anyone interested.

What command’s limitation surprised you the most when you were learning?

https://redd.it/1pv88w1
@r_bash

[Script]Files & Directories backup noscript
https://dpaste.com/7HPYRC2C3

https://redd.it/1pvq3ui
@r_bash

Improving the "command failed with exit 129" errors; check out my project: dexit - "Decode Exit".
https://github.com/eatnumber1/dexit

https://redd.it/1pvutw5
@r_bash

Tenho feito um curso de bash do "you stuck at programming" e isso me incentivou a usar o bash mas o recurso do fish de recomendação de comandos é tão melhror, que pra mim não faz sentido usar outro shell

Qual o motivo que vc usa bash?

https://redd.it/1px4yvz
@r_bash

guys i made a timer (im new to bash)

\#!/bin/bash



while true; do

clear



time=$(date +"%H:%M:%S")



echo "

\+------------+

| $time |

\+------------+

"

sleep 1

done



https://redd.it/1pxnwy4
@r_bash