question from a newbie. what's the best way to translate reply inputs?

Sorry about formatting, on mobile and its nearly 3 a.m. Right now I'm doing a project making a calculator in bash and I have everything done but one task. I need to translate the input from the operation select menu so it's always lower case. I feel so stupid but I can't figure it out and it's been hours.

This is my first interaction with bash noscripting and I gotten If then down but I'm struggling with loops.

Thank you, if you need my noscript I'll post in a few hours once I get some sleep.

https://redd.it/zll2qu
@r_bash

How can I make an input function?

I was wondering if it's possible to make a simple function like this, where you can input a string while calling the function stringLenghtCalculator(hello) and the function calculates the length of the input

stringLenghtCalculator($inputString){
"$(($(echo $inputString | wc -m)-1))"
}

https://redd.it/zlod9f
@r_bash

getent passwd {$min..$max} not working, {1000..60000} does

Hi! I'm trying to use getent passwd {$min..$max} in a noscript.

If I echo $min or echo $max before the getent command, it's 1000 and 60000 respectively.

getent passwd {1000..60000} gives me all info I need. Why doesn't variables work?

https://redd.it/zlo2wp
@r_bash

cp -rv command without verbosing only the dir name?

Is it possible to print only the dir names (and probably the subdirs) only when using cp with -v?


If the answer is awk, I'd kindly ask the exact solution.

https://redd.it/zlq7vp
@r_bash

Need help with flag names

I have homework where I have to make a noscript that counts words, characters, lines, paragraphs and so on withot using things like wc. I have this done. The thing is, my teacher insists that when running the noscript in terminal, it has to be called like this:

./noscript.sh -file test.txt -number 10

I have all this done and it works, except I have no idea how to make it so that the flag names can be strings and not single characters, without using double dashes --.

Right now I have it like this:

./noscript.sh -f test.txt -n 10

And it all works, but how can I change my getopts (or is there a different way?), so that the flag names can be long?

Also, here is a snippet of my getopts part:

while getopts ":f:n:" opt; do
case $opt in
f) file=$OPTARG

​

Ive also tried doing it like ":file:number:" but it doesnt seem to work

https://redd.it/zltbom
@r_bash

Unexpected `Warning: unknown mime-type for ...` from awk

Why I obtain this unexpected error? I don't understand what `awk` wants to be done? Here is my code:

#!/usr/bin/env bash

# Just leading spaces are remvoed and placeholders with square brackets.
# Entries are separated via empty blank lines.
# Anything else is being unthouched.
get_values_and_options() {
declare config_path="$1"

awk 'BEGIN {
values = "\\s+#\\s+Default\\s+=\\s+"
option_or_values = "^(\\w" "|" values ")"

}

$0 ~ option_or_values {
result = gensub(/\[[A-Za-z0-9 ]+\]/, "", "g", gensub(/\s+=.*/, "", "1", gensub(values, "", "1")))
if (result !~ /--/) # If it's not a line with option values then it's the last entry line with just option name after which a blank line should be.
result = gensub(/$/, "\n\n", "1", result)

print result
}' "$config_path"
}

declare config_path="../assets/default_config.ini"
declare values_and_options="$(get_values_and_options "$config_path")"
print "$values_and_options"

And here is a sample from input file:

[config-meta]
#---------------------------------------------------------------
# If 'True', program starts with all config settings immediately
# If 'False', program starts with default settings immediately, ignoring any config settings
# If 'Ask', program Asks to use config settings at start. And if you have multiple configs, will ask which to use
# NOTE: This setting only applies to the primary config file ("SpamPurgeConfig.ini"), not any other configs you make
# Default = Ask -- Possible Values: True | False | Ask
use_this_config = Ask

# A short denoscription to show for this config file when asking which config file to choose
# > Examples: "Scan last 3 videos with auto smart", "Scan last video for [some phrase]"
# This ONLY matters if you have multiple config files (such as "SpamPurgeConfig2.ini", "SpamPurgeConfig3.ini", etc)
# Possible Values: Anything
this_config_denoscription = My Custom Config

I wanna just delimit my items and make output to be smth like this (default values are always put before `--`):

Ask -- Possible Values: True | False | Ask
use_this_config = Ask

Anything
this_config_denoscription

https://redd.it/zlkylm
@r_bash

sshto

Hi, I've just added another handy command to sshto!
Mount - it allows you to mount some folder from remote server to some local folder.
And then use this remote folder as local! Sshfs must be installed in order to use this feature.

Also Unmount and Home commands where added to cooperate with Mount.

Have fun!)

https://redd.it/zlxlcx
@r_bash

aliases for multi-word commands like gh issue list or specific command options?

I manage my Github issues from the command line using gh issue on a regular basis, and since there are a lot of them I find myself running gh issue list -L 100 quite regularly (-L 100 increases the number of issues listed to 100).

Is there a way to set an alias so that I can type gh issue list and have it automatically add the -L 100 but not affect, for instance, gh issue create or gh issue comment? I'm sure I could set alias list="list -L 100", but I can easily see that adversely affecting other commands so I'd rather not. I'm also aware that I could simply alias this specific command to something like ghil but I'm curious and I think learning how to set aliases with multiple words could be useful for a lot of things outside of this one specific use-case.

Is this possible?

https://redd.it/zm2x48
@r_bash

How to start a process in the background from a bash noscript but then kill that process when I Ctrl+C see the noscript?

I have this noscript:

#!/bin/bash

sudo nginx -t
if ! ss -l | grep 10002 > /dev/null
then
sudo nginx
else
sudo nginx -s reload
fi
python loop.py > /dev/null &
python app.py

This noscript is supposed to test the nginx config file, then check if nginx is running, if its not running, start it, if it is running reload it, then run a python noscript which is an infinite loop, then load a flask app.

If i don't add the '&' on the loop the flask app will never load because the loop will never end. However, when I press Ctrl+C on this noscript I want both loop.py and app.py to end process.

But right now only app.py ends and loop.py keeps running (I assume because it spawned a child process). How can I make it so loop.py ends when I Ctrl+C?

https://redd.it/zm42ox
@r_bash

found a noscript in a file i was sent and I'm wondering what exactly it does.

edited to fix format.
#!/bin/bash
filename=$1
sed -n '1~4s/^@/>/p;2~4p' $filename | awk '{print $1}' > $filename.fasta

https://redd.it/zm6c6b
@r_bash

"type -P" vs "type -p"

As per help type output

-P force a PATH search for each NAME, even if it is an alias,
builtin, or function, and returns the name of the disk file
that would be executed
-p returns either the name of the disk file that would be executed,
or nothing if type -t NAME' would not return file'

Could someone please provide an example when there is a difference in -P vs -p output?

https://redd.it/zm7dke
@r_bash

How can I append an output at the end of a line on a file?

I want to append the output of the following code at the end of every line in a file

echo "$(printf "%0d" "$x" 0)$exampleString" | perl -lape '$_=pack"(B8)",@F'

I think sed is the right way to go, but I just don't know how to fit all that piece of code

https://redd.it/zmh5hs
@r_bash

grep output for a file not found - How can I redirect that message to a new variable?

I have the following as an example,

​

echo -e "-------------------\nJournalctl Log Results:\n-------------------"
GREPJOURNALCTL=$( journalctl | grep $input | tail -10 )
if [ -z "$GREPJOURNALCTL" ]
then
echo -e "\n${G}No Results Found${NC}\n"
else
echo -e "\n${R}Results Found${NC}\n"
sleep 1s
echo $GREPJOURNALCTL
echo ""
fi
sleep 1s

Then I would get "grep: /var/log/dmesg: No such file or directory"

Can I redirect that to a variable or is that already is redirected to a variable with GREP\JOURNALCTL? If impossible, can I redirect the stderr message to null? I've tried adding 2>&1 /dev/null but it didn't work for me :S

https://redd.it/zmjh4y
@r_bash

Creating a bash noscript that uses a python package

I am running a python [package](https://hippmapp3r.readthedocs.io/en/latest/hipp_seg.html) in my linux terminal. I would like to create a loop noscript that says to use the python package to perform a function. Currently, my workflow is like this:

source activate hippmapper

hippmapper seg_hipp -t1 participantnumber.nii.gz -o participantnumber_transformed.nii.gz

conda deactivate

This is fine if I was doing one participant, but I have 671, and potentially MANY more.

I have a working shell noscript for another process, so I am using that as a template to adapt. However, altering it to what I need doesn't work, and I am unsure why. **I am activating my python environment (that I have called hippmapper) before running the shell noscript. Should it be inside the noscript?**

#!/bin/sh
parent_folder="path/here"
for i in folder1 folder2 folder3; do hippmapper seg_hipp -t1 ${parent_folder}/${i}/${i}_1_T1W.nii.gz -o ${parent_folder}/${i}/${i}_transformed.nii.gz; done

This code above does not work.

https://redd.it/zmkt04
@r_bash

Grep lines from a file, that have special chars in them.

I’m trying to check existing crontab entries against a file, to ensure everything in the file is loaded in to cron.
So my function is basically:
func(){
while IFS= read -r line
do
if ! crontab -l | grep -fq “${line}”. > /dev/null 2>&1
then
return 1
fi
done < crons.file
return 0
}

The issue is that, grep reads $line as a regex pattern. I can’t put single quotes around $line to make it not read it as a regex, because then $line won’t expand.
How do I navigate this? Thanks in advance!!!

https://redd.it/zmrdgn
@r_bash

Needed some dummy files and directories with unique md5sums, random file sizes. This is the final result.

This will create 3 functions:

1. randint() that takes a min and max values
2. genextension() which uses randint to pick a number from 1 to 10 and print that corresponing extension
3. genfiles() will use all defined functions and use the dd util and gather input from urandom to make the files.

&#x200B;

randint() { expr $(expr ${RANDOM} % $(expr $(expr ${2} - ${1}) + ${1})) + ${1} ; }; genextension() { randext=$(randint 1 10); echo ".txt .jpg .png .exe .json .wav .mp3 .doc .docx" | awk -F " " -v i=${randext} '{ print$i }'; };genfiles() { totalfiles=$(randint ${1} ${2});totaldirs=$(randint 5 10); for (( i=0;i<totalfiles;i++ ));do filename="${3}/file_${i}$(genextension)"; dd if=/dev/urandom of=${filename} bs=100b count=$(randint 1 10) &> /dev/null; du -h ${filename};done; for (( i=0;i<totaldirs;i++ ));do mkdir -p dir_${i};done; }; genfiles 1 15 .; for d in $(ls); do if [ -d ${d} ]; then genfiles 1 15 ${d};fi;done;

&#x200B;

A total of 1 to 15 dummy files and a total of 5 to 10 dummy directories will be created on the current working directory. I know its not pretty, but still bash? 😁

https://redd.it/zmtk8e
@r_bash

The simplest of bash noscripts only runs in terminal so many lines before closing prematurely, Despite there being more perfectly fine code to run.

OK, so my noscript is a simple story for a friend as part of her CBT trauma therapy I'm trying to help her with. The noscript is just a bunch of echos with some shuf thrown in to make the story a little different every time it is read. (obviously when im more skilled i plan to use case statements and else if type stuff as well but im not there yet so im working with what ive got.)
My problem is It closes prematurely. Its closing despite shellcheck.net saying there are no errors! (My first one btw, YAY!) is there an answer to why it closes prematurely without a good reason? or a way to link multiple short noscripts to run one after the other if they can only be so long for some reason. Is there a way to extend the length of the noscript the terminal will run? ive kinda hit a wall, and it needs to it be a much more detailed and personalized narrative for it to be an effective CBT therapy tool for my friend who truly deserves it. And this community has been so kind in helping me on my learning noscripting journey, so a big thanks in advance to anyone who can help me figure this one out.

https://redd.it/zmvjc4
@r_bash

new to bash please help

hi so im new to bash and want to create a box with '-+' around words i have this but not sure why it isnt working. could someone help me please:

function generateBanner {

length=${#1}

echo -n '+'

for i in {0..$($length-3)}

do

echo -n '-'

done

echo '+'

}

https://redd.it/zmx7w9
@r_bash

new to bash please help

hi so im trying to create a box with - and + in the corners but the box doesnt go all the way around this is my code and the output is bellow it. any help would be greatly appreciated.

\#!/bin/bash

function generateBanner {

length=${#1}

echo -n '+'

for i in {0..$length-3}

do

echo -n '-'

done

echo '+'

}

clear

&#x200B;

welcomeMsg = '| hi how are you |'

generateBanner $welcomeMsg

echo $welcomeMsg

generateBanner $welcomeMsg

&#x200B;

&#x200B;

&#x200B;

\+-+

|hi how are you |

\+-+

https://redd.it/zmzlch
@r_bash

xargs string concatination

I'm builing a litte wrapper for diskus. I want find files or folders using find and then calculate their size; sort it by size and pass it to fzf. I was trying to do that using xargs. The problem is: diskus only prints the file size. What I want is the file size next to the file name. xargs is not mandatory, but I'm looking for the fastest possible solution for this kind of task. This is what I have:

find $PWD -maxdepth 1 -print0 | xargs -0 -I % diskus % | sort -r -h | fzf

But I could not figure out how to concatinate the output of diskus with the output of find (the file name).

Can somone help? If you think another approach would be faster/better I'm happy to hear that.

Thanks in advance!

EDIT:

To concatinate I tried something like this:

$ find $PWD -maxdepth 1 -print0 | xargs -0 -I {} printf "%s %s" $(diskus --size-format decimal {}) {}
diskus warning the results may be tainted. Re-run with -v/--verbose to print all errors.


If you don't have diskus you can use something like this for testing:

find $PWD -maxdepth 1 -print0 | xargs -0 -I {} printf "%s %s \n" $(file -b {}) {} | fzf

Edit 2:find $PWD -maxdepth 1 -print0 | xargs -0 -I {} printf "%s %s \\n" $(file -b {}) {} | fzf

to test you could use e.g /tmp or any other folder with files :)

https://redd.it/znakux
@r_bash

Automatically Sourcing ~.config/bash/bashrc Doesn't Work

I want to move my ~/.bashrc to ~/.config/bash/bashrc.

This is my ~/.bashprofile:

```
[[ -f ~/.config/bash/bashrc ]] && source ~/.config/bash/bashrc
```

However, that file is not sourced automatically when I start a login shell.

The same syntax works in a ~/.bashprofile with these contents:

[[ -f ~/.bashrc ]] && source ~/.bashrc

I've been unsuccessful googling this behaviour. Any of you wizards know what's up?

ETA: Can't edit the noscript. No, it's not because I forgot the slash. :-)

https://redd.it/zndgij
@r_bash