How to delete empty lines in multiple files?

I tried this but it didn't worked:

sed -i '/^$/d' *.txt

I want to be able to delete empty lines in files in subdirectories as well.

https://redd.it/ythb7w
@r_bash

A way to run a noscript called XYZ.sh and the output will be in a file called XYX.out

I was asked to write a noscript that a user could run and the output would be easy for them to copy.

Although this is not what the noscript did it is an example where if you run a noscript called "AScript.sh" the user will see the output and have a noscript called "AScript.out" after.
I hope someone finds the idea useful.

#!/usr/bin/env bash               
                                  
# Get the noscript name             
Me="${0##*/}"                     
                                  
( (                               
                                  
    # do a read from the df command
    while read -r MountPoint Type; do
                                  
        # print out a command     
        echo "${MountPoint} uses filesystem type ${Type}"
        sleep 2                   
                                  
        # From inside the first loop do something withn the mount point
        while read -r FoundFile; do
                                  
            #  Print out a message
            echo "I have found your file \"${FoundFile}\" in filesystem \"${MountPoint}\""
                                  
        done< <(find "${MountPoint}" -xdev -type f -iname "*[a-c].mp4" 2> /dev/null)
                                  
    # run a df and pass it to read 
    done< <(df -PTh -txfs -text{3,4} | awk '!/ilesystem/ { print $7 " " $2}')
                                  
) 2>&1 ) | tee "${Me/%sh/out}" 

https://redd.it/ytm2ud
@r_bash

Bash noscript to rename files excluding names in an array

I currenlty have a noscript where I rename files by removing whitespace and certain names.

prename -v 's/ /_/g' *

prename -v 's/_-_/_/g' *

prename -v 's/_\(Summer-HD\)//ig' *

prename -v 's/_\(Hammer\)//ig' *

prename -v 's/_\(Hardware-Hybrid\)//g' *

prename -v 's/_\(digital\)//ig' *

prename -v 's/_\(Resolution-SD\)//ig' *

What I have tried is a for loop and place name in an array but that has not worked.


exclude=('(Summer-HD)' '(Hammer)' '(digital)' '(Resolution-SD)' '(Vacation)' '(Hammer-Hybrid)')

for x in "${exclude[@]}";
do prename -v 's/$x/_/g' * {} \;
done

This for loop does not work at all, and I'm not sure if I can pass a variable to prename. I would like to put the names in an array since I currently have more than 200 that i would like to remove. This list will grow as I restore these files from old backups.

https://redd.it/ytqnsb
@r_bash

ASCII Pendulum written in BASH noscript

I am so excited to share my BASH ASCII graphics library.
Been working on it for a while and its finally working.
I made a ASCII pendulum using it.

I've named the library - baSHed2D

Tbh the whole logic of pendulum was copied from coding train YouTube channel's p5.js pendulum video😅

Here's the Demo Video

YouTube link

Ans here's the code

GitHub link

Please review my code and suggestions are welcomed and I actually need some suggestions to improve this.

What you can do using baSHed2D

Draw lines,

Draw circles,

Draw rectangle,

Move these shapes


I will add mouse location getters too.

And a huge thanks to you guys, i had some issues regarding my code and I posted it here. It was for the line drawing algorithm, you guys are great. I learnt so much from your advices.

https://redd.it/ytriej
@r_bash

what are you guys toughts on this, and how can i fixed?
https://redd.it/ytujy2
@r_bash

Correct way to insert text in columns

I have this Columns in a text file.

Lets say i would like to add a column to Countries or Numbers or Cities.

What would be the correct way to do this?

I've tried this, to insert in the second column.

printf '%-20s' 'Stockholm' | paste -d "\\t" /file.txt -

Numbers Cities Countries
232323 blahblah waeawewae
232323 blahdadad waeawewaew
123123 asdsadads waewaewaea
123123 asdasdasd waeaweawea

​

https://redd.it/ytw075
@r_bash

Running bash noscript from outside Terminal, won't pick up second flag ¯\_(ツ)_/¯

Hi,
I'm running a noscript from Lingon X, a scheduler on macos. It generally works but ignores the *--cuesheet* flag. Can anyone see why?

Lingon X uses this command:

/bin/bash -li /Users/goggle-moggle/iplayer.sh

The iplayer.sh noscript looks like this:

#!/bin/bash

shopt -s expand_aliases

alias gip='get_iplayer --file-prefix="<name> - <episode> <pid> <version>" --pid '

gip m000b075 --pid-recursive --cuesheet
gip b09ymqm4 --pid-recursive --cuesheet


The noscript works as expected when I run from Terminal.
Thanks!

https://redd.it/ytwsi0
@r_bash

Round robin algorithm in bash noscript

Hi everyone. So I just started learning bash noscript a few weeks ago. I got an assignment and I have no idea how to do this. I kinda wrote in C# but I dont know how to write in bash. Can anyone help? below is the prompt

Provide a detailed specification, and design of the bash noscript that will emulate the behaviour of the round robin scheduling algorithm

https://redd.it/ytyxak
@r_bash

A bit of old hummer from rec.humor.funny Usenet group
https://redd.it/yu8o01
@r_bash

Check if executable has a live process

How to write a bash noscript which checks periodically specific executable has a live process. Say call it as ./check executable_name

https://redd.it/yu8xvc
@r_bash

How to show the directory in prompt only in the current line?
https://redd.it/yue4so
@r_bash

Scripting Issue - new to noscripting

I'm trying to create a noscript that uses one argument, and only one argument. This argument specifies the number of minutes to count down. It should start with the number of minutes, then count down second by second writing the text "there are x seconds remaining". When there is no time left the noscript should echo "time is over" and then quit.


So far I have this:

!#/bin/bash

for (( COUNTER=$1; COUNTER>0; COUNTER-- )); do sleep 1

echo "there are $COUNTER seconds remaining"

done

echo "time is over"

exit 0

&#x200B;

&#x200B;

This noscript counts down by the second if I run "bash noscript 5" it will count down 5 seconds, but I need it to count down 5 minutes, second by second when I do that. Appreciate all help

https://redd.it/yueqeh
@r_bash

The most secret and vital piece of kit for the ongoing war between my friend and I.

\#!/bin/bash

&#x200B;

rootvegatable='potato'

rootvegatable='cabbage'

rootvegatable='carrot'

rootvegatable='turnip'

echo"your quest to find out your destiny is nigh at hand"

sleep 3

echo"Lucy we have used are arcane arts"

sleep 3

echo"some of our most arcane secrets and sacred rights have been used to reveal the truth of your destiny"

sleep 3

echo "the spirits have spoken and your destiny is is that of the noble %$RANDOM$rootvegatable

&#x200B;

&#x200B;

It's the last line that tripping me up how do I make it choose a random variable?

https://redd.it/yuarsa
@r_bash

What is the underscore variable in bash, that always is set to my last issued command?

When executing env, I'll see a set of variables, including one that is (named) the underscore '_' which has my last command. eg:

# env
SHELL=/usr/local/bin/bash
LESSHISTFILE=-
XPCFLAGS=0x0
HISTCONTROL=ignorespace:ignoredups:erasedups
HISTIGNORE=&;???;*sudo -S*
...
BLOCKSIZE=1024
=/usr/bin/env <----------------- here!

I wonder what this is called (as in: how to google for it for more details) and if I could make use of it (besides the usual ways to recall the last command[s\] from history with !$ !! !-2 etc.).

Thanks in advance!

FWIW: bash 5.2.9, but it has been there since ... forever?

https://redd.it/yv274j
@r_bash

How do I make my prompt show the directory string only in the current line?
https://redd.it/yv5ozd
@r_bash

What are some resources for markup/prettifying bash commands for presentations?

I have the following bash noscript which runs python3:

python3 /dir/to/python_code.py --option1 param1 --option2 param2

I have tried to use editors like https://carbon.now.sh/

but they all show something like

https://preview.redd.it/ofv5i8qzpyz91.png?width=1380&format=png&auto=webp&s=e7c4555f0db1503667c967d0fed0a45e38ea7410

where the python3 bit is colored, but nothing else. I am hoping to get more coloring, especially in the options. Is there an alternative editor that can do that? Thanks.

https://redd.it/yv8qqj
@r_bash

Print pattern match once line below was found

I've got a really annoying problem. In my text file I have a number of objects that relate to an object group. An example is below.

object-group network TEST-GROUP1
network-object object SERVER1
network-object object SERVER2
network-object object SERVER3
network-object object SERVER4

The number of objects inside of any object-group can vary. What I need to do is check what object-groups, my object is a part of. So for example, how would I find if SERVER3 was part of an object group, and if it was, print that object group it's a member of.

Note, SERVER3 may be part of many object groups.

https://redd.it/yvcl79
@r_bash

Execute command for new files in directory tree

I currently have a noscript that uses fswatch to detect new files in a directory tree. In general it seems to work fine and I'm now trying to make the process more resilient. I'm looking for ways to handle the case where the watch noscript isn't running and a new file is added before the watch noscript is restarted. What are my options for this scenario?

https://redd.it/yvf58k
@r_bash