Made a simple Bash noscript to quickly switch Linux power profiles

Hey everyone,

I recently built a small Bash noscript called Power-CLI for myself. Since I use a WM, switching Linux power modes manually was kind of annoying, so I made a quick terminal tool to toggle between Performance, Balanced, and Power Saver modes — with notifications and sound alerts.

It’s not flashy or overcomplicated, just something that gets the job done. Thought it might be useful for others who want a simple, lightweight solution.

Fun fact: Bash is the first language I’ve learned, and I enjoy building small tools for myself just for fun.

Check it out here: https://github.com/AkshitBanotra/power-cli

https://redd.it/1n6mpbq
@r_bash

A comprehensive Linux guide worth checking out

Hey folks,

If you’re learning Linux or just want a solid reference to keep around, I found The Complete Reference: Linux (6th Edition) super helpful.

It covers everything from the basics to managing users, networks, filesystems, and even configuring Internet services. Honestly, it’s the kind of book you can flip open any time you get stuck.

I’m sharing a free copy here Book

Hopefully it helps someone who’s on their Linux journey

https://redd.it/1n6vzas
@r_bash

Problem with noscript runnign after wake from sleep

Fedora 42 w/ KDE

I have a bash logon noscript that runs a program at login, but I need to do the same thing when I return from sleep. I have created a sh noscript called wakeup_noscript in /usr/lib/systemd/system-sleep/ and made it executable. Sadly, it does not run the program when I return from sleep.

What have I missed here?

#!/bin/sh
case $1 in
post)
/usr/bin/myapplication
;;
esac



https://redd.it/1n6e09e
@r_bash

How to extract block separated by two newlines?

I have a text file. I want to extract the last block separated by two newline chars.

How to do that?

Example:

echo -e 'pre\n\nblock\nfirst\n\npost\n\nblock\nLAST\n\nsomechars'

How to get

block
LAST

?


https://redd.it/1n781cp
@r_bash

Cron won't run my noscript properly

https://redd.it/1n7jeoc
@r_bash

Cron won't run my noscript properly

https://redd.it/1n7iunv
@r_bash

Help with bash noscript

Hi everyone, not sure if this is the correct place to ask for this, apologies if it isn't. I'm very new to bash and I'm trying to make a noscript that will scan all .md files in a specified directory (recursively, if possible) and extract all unique written paths (not links!). For example, an md file contains the following:

This is how you change the working directory:

    cd /example/path/foo/bar
    

So I want the noscript to return the string "/example/path/foo/bar" and which file(s) it was found in. It should ignore links to other files and also URLs. Is this possible? I feel stupid for struggling with this as much as I have

https://redd.it/1n7h1j6
@r_bash

No "isempty/0" ?? `jq 'select(.good-filenames | isempty)' data.jsonl`

Hi, I am fighting with Gemini AI, ChatGPT and Deepseek R1 about this line (and I am not sure whether to ask here or elsewhere)..

Can anybody tell me who is right?

jq 'select(.good-filenames | isempty)' data.jsonl`jq 'select(.good-filenames | isempty)' data.jsonl
jq: error: isempty/0 is not defined at <top-level>, line 1, column 30:
select(.["good-filenames"] | isempty)
^^^^^^^
jq: 1 compile error

For filtering all dicts where the array "good-filenames" is empty. Example:

{
"hash": "835618ffc68bbd70195dc4d189ff2b1f",
"good-filenames": [],
"bad_filenames": [
"stuff.txt"
]
}

# my binaries
> which jq
/home/user1/bin/jq
> /home/user1/bin/jq --version # which I downloaded from https://github.com/jqlang)
jq-1.8.1

From what I got from github (https://github.com/jqlang/jq/releases/tag/jq-1.8.1) there is ONLY `isempty/1` and no `isempty/0`. (looked through the Man pages etc!)

Who is right? The human or the 3 AIs?

https://redd.it/1n7a9em
@r_bash

I made a AI-powered CLI tool (No api calls) to convert natural language to shell commands

So here’s the thing: when I first started using the terminal, I honestly thought I needed a **PhD in Dark Arts & Arcane Spellcasting** just to do basic stuff.
Like…

>

After googling the *same damn commands* for the **500th time**, I had a thought:

>

So I thought maybe there was a tool that would help beginners and other people through without calling api or anything and should be light weight.
And boom **Shazam** was born (default name is Jarvis but you can call it Friday, Alfred, or even Papi if that’s your vibe).

# What it does:

You type this:

jarvis "change directory to Desktop"


And it prints this into your shell:

cd Desktop/


No ChatGPT API keys, no cloud BS, it runs a local GGUF model under the hood. And its quite light weight. To know more about how it works [click here](https://github.com/Sudheesh-07/shazam/blob/main/MODEL.md). If you want to contribute [repo is here](https://github.com/Sudheesh-07/shazam)

# Stuff I need help with:

* Currently it prints the command not on a readline but just as a output i want it to work on anew readline (I dont really know much about the low level programming to do so PS: codebase is in python)
* Making it play nice on various shells and OSs.
* Packaging it for Homebrew / apt so others can install it without issues.
* Smarter parsing → like remembering your context, chaining commands, etc.
* Basically everything that makes it cooler.

# Stuff that’s already in:

* Works in Bash, and Zsh
* Config file where you can rename your assistant (yes, you can call it Waifu if you want).
* Works througout your device no need to be in the root directory to use
* Can use -r or --run flag to directly execute

[Repo here](https://github.com/Sudheesh-07/shazam)

I legit think this could be a fun open-source project. With a lot of things to make it actually working and useful. So please feel to make contributions and make a great community project.

https://redd.it/1n82hqf
@r_bash

What are the most common reasons for a bash shell to get messed up?

Sometimes while scrolling backwards through my history, when I pass through a certain entry, the bash shell gets messed up. I seem to appear my PS1 and PS2 prompt string and the position of the cursor does no longer match if I actually edit a command. If later I watch the history, the edit was done at a different place than where the cursor was at.

Most of the times a reset command helps but not always.

Now I noticed something. The shell where I have the problem is in an i3 desktop that in itself runs in a remote desktop session. When I try to scroll through the exact same history when I SSH to the same host from Terminal.app on my Mac, I don't have the problem.

Might this be related to resizing of windows and the Bash shell not relying on correct information?

https://redd.it/1n829q3
@r_bash

Any recommended upload/download sites for this subreddit?

I'm currently doing the documentation/readme on my bash implementation of "Conway's Life Game". I don't see an option to upload attachments here. I'm a hobbyist, not a professional, and I have no idea how to set up and maintain a github repository like many people do here for downloading their creations. Is there a recommended site where I can upload a tarball for people to download? Right now I'm looking at approx 82 kbytes, which goes down to approx 16 kbytes as a .tgz file.

https://redd.it/1n8v1q5
@r_bash