Two functions, "define" and "defined?", that help you figure out whether a name has a behavior, value, executable, or definition attached to it
https://github.com/pmarreck/dotfiles/blob/master/bin/define.sh

https://redd.it/ysld5d
@r_bash

Making an alias disregard other aliases

I'm trying to rebind some dangerous commands. I keep accidentally invoking dd in the terminal, so I had the idea of aliasing "dd" to an error message, and another alias like "disk-destroyer" to the actual dd utility into. So I did this:

​

alias disk-destroyer='dd'

alias dd="echo 'Probably the wrong command. Use alias \"disk-destroyer\" for the actual dd command.'"

​

The problem here is that "disk-destroyer" will link back to the dd alias. Is there any way around it?

https://redd.it/ysng2m
@r_bash

Why won’t this bash noscript work?

#! bin/bash #

Printing System Variables #Print Bash shell name

echo $BASH # Print Bash shell Version

echo $BASH_VERSION # Print Home directory name

echo $HOME *

https://redd.it/ysppjw
@r_bash

How can I loop through all files with file extension within a certain set of extensions?

I want to loop through all files ending in `.mp3` or `.mp4`.

I know that I can do

for f in *.{mp3,mp4}; do

However if there happen to be no mp3 files, f will also assume the value `*.mp3` which is unwanted.

​

If I only want to consider one file extension, I know that I can do

for f in *.mp3; do
[ -f "$f" ] || break

But this does not easily apply to more file extensions.

Thank you for your help!

https://redd.it/ysoiea
@r_bash

Cluster; After the job finishes ,How to initiate file transfer? WinSCP

The cluster I am working with sends emails after finishing a job.

How can I monitor email to initiate the file transfer may be it with WinSCP or through a shell noscript?

Actually, I need to have a large number of plots and calculations to be made on the go; how can I do that?

https://redd.it/ysofcb
@r_bash

Curl request

I have a textfile which i would like to send to my telegrambot. The issue iam facing is that the textfile does not get sorted correctly when i post it through the curl request.

But when i run it in terminal it sorts nicely without any issues.

curl -s --data text="$(cat '/files/test.txt')" --data-urlencode "chat_id=@chatid123" 'https://api.telegram.org/botmyapikey/sendMessage'

This below is the format i want. I've read about word splitting but the quotes around the cat command does not seem to make a difference.

eurusd 1621
gbpusd 1539
eurcad 1332
gbpcad 1116
nzdusd 1054
nzdcad 928
audcad 867
eurgbp 324
xauusd 133
euraud -25
audnzd -128
eurnzd -213
gbpaud -484
gbpnzd -753
usdcad -804
eurchf -840
eurjpy -856
btcusd -1186
gbpjpy -1480
cadjpy -1604
xaujpy -2432
usdjpy -3058

Help is appreciated

https://redd.it/yt5sry
@r_bash

Need help with noscript- new to bash noscripting

https://redd.it/ytc1lu
@r_bash

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