noob here progress bar

I have this simple function in .bashrc:

0x0() { [ -z "$1" -o -r "$1" ] && curl --progress-bar -F"file=@${1:--}" -Fexpires=48 `https://0x0.st` || echo -e "error: bla bla bla"; }


it works perfectly but no progress bar is shown, why??

https://redd.it/1fzxxl4
@r_bash

A Bash Script To Display Animated Christmas Tree In Terminal
https://redd.it/1g0f2jc
@r_bash

Stupid question but ...

Hello everyone,



I'm trying to set up a cron job to shut down my students' computers at a fixed time, but it doesn't work: the computers stay on.

I have 3 users on each computer:

Teacher

Student

root



In the "crontab -e" students I enter the following command:

14 17 * * 1-5 /sbin/shutdown -h +1



Thank you in advance for telling me where the error is.



Mark

https://redd.it/1g0gcm9
@r_bash

My ASCII graphics basic demo engine in BASH language: ISObash.
https://redd.it/1g0jaqj
@r_bash

How to remove all directories that don't contain specific filetypes?

I've made a bit of mess of my music library and am sorting things with beets.io.

It's leaving behind a lot of cruft.

Is there a command I can run recuresibly that will delete all directories and files do not contain *.flac, *.mp3, *.ogg?

I've got hundreds of folders and subfolders much of which is just extra album art or *.m3u kinda stuff I would love to avoid manually going through them.



https://redd.it/1g0jq93
@r_bash

"sudo <command>" doesn't use system wide bash config.

I have created a system wide configuration for bash at /etc/bash.bashrc to format the prompt and source pywal colors so that I don't need to manage a separate config file for root and my user account. However, the colors are only applied when I run a command without elevated privileges. So, it works fine for my user account, and if I actually sign in as root before issuing the command; but if I were to type "sudo ls" while being signed in as my user, the text output remains completely white instead of using my color palette. Can anyone in here explain this behavior and would you be willing to tell me what I need to do to get it working correctly? Here are the contents of my /etc/bash.bashrc:

/etc
$ cat bash.bashrc
# If not running interactively, don't do anything
[ $- != *i* ] && return

# Grab colors from pywal
(cat /home/ego/.cache/wal/sequences &)
source /home/ego/.cache/wal/colors-tty.sh

# Prompt
PS1='\n\w\n\$ '

# Enable color output
alias ls="ls --color=auto"

https://redd.it/1g0ujfr
@r_bash

Super simple question - How can I keep Neovim from opening if fzf is closed with <C-c>?

I have a simple alias which uses fzf to search for and open a file in neovim:

alias nv='nvim$(find . -maxdepth 1 -not -type d | fzf --preveiw="cat {}" --tmux)'

This works pretty much exactly as I want it to (although if it could be better I'd love to know how), but if I close the fzf using ctrl+c neovim will still open a new file.

https://redd.it/1g0zbv9
@r_bash

What boredom does to a man replicating the old TVs 'no signal' color bars in BASH
https://redd.it/1g16wrq
@r_bash

Script to rename multiple files quickly using vim
https://redd.it/1g1hrtf
@r_bash

I would like to make this less stupid but have no idea of what to use to get the same result.

echo $((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))$((RANDOM % 2))

the result is a random sequence of number of 0s and 1s

1010010101111111010010110110001011100100100010110110101001101010111001001111110010100101011100101000000011010100111000101101110001111010

https://redd.it/1g1y4i6
@r_bash

A bash banner

https://preview.redd.it/y17eh6ai7eud1.png?width=1142&format=png&auto=webp&s=7a7a7f394fb9996aade20227d11263ea3792e99a

Script here, minus the allergens/uv data since that requires a lot of extra infrastructure:

https://gist.github.com/robbieh/c12d355ea074a7aeef9d847d76ad69f8

This noscript is designed to be run in .bashrc so I get relevant info when I first sit down and open a terminal. After the first time it shows, new terminals will get a much more terse version so that it doesn't become annoying. That resets after an hour.

The noscript contains a way to make a header with figlet and run just about anything to the right of it. That was tricky to work out.

https://redd.it/1g2a7ja
@r_bash

probably stupid mistake

i dont know why but this dont work

printf "%d" $((RANDOM & 1)){$string}; echo

when this does

printf "%d" $((RANDOM & 1)){,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,}; echo

https://redd.it/1g2j8n0
@r_bash

Very useful :)
https://redd.it/1g2pexu
@r_bash

Script for creating local web env

Hi, I'm practicing creating a bash noscript to streamline setting up a local web development environment for WordPress. Anyone care to give some feedback on this noscript or some best practices in general?

#!/bin/bash



# Define colors

GREEN='\033[0;32m'

YELLOW='\033[0;33m'

RED='\033[0;31m'

RESET='\033[0m'



# Ask user for project name

read -p "Enter the project name: " PROJECT_NAME



# Check if input is not empty and doesn't containt spaces

if [[ -z "$PROJECT_NAME" || "$PROJECT_NAME" =~ [[:space:]] ]]; then

echo -e "${YELLOW}Project name cannot be empty or contain spaces.${RESET}"

exit 1

fi



# Define variables

PROJECT_DIR="/var/www/html/$PROJECT_NAME"

DB_NAME="$PROJECT_NAME"

DB_USER="root"

DB_PASSWORD=""

DB_HOST="localhost"

WP_HOME="http://$PROJECT_NAME.local"

WP_SITEURL="http://$PROJECT_NAME.local/wp"

APACHE_CONF="/etc/apache2/sites-available/$PROJECT_NAME.conf"

ETC_HOSTS="/etc/hosts"



# Check if the project directory already exists

if [ -d "$PROJECT_DIR" ];

then

echo -e "${YELLOW}$PROJECT_NAME already exists. Please choose another name.${RESET}"

exit 1

fi



# Create the directory using bedrock

composer create-project roots/bedrock "$PROJECT_DIR"



# Ensure Apache can read and write to the Bedrock directory

sudo chown -R www-data:www-data "$PROJECT_DIR"

sudo find "$PROJECT_DIR" -type d -exec chmod 755 {} \;

sudo find "$PROJECT_DIR" -type f -exec chmod 755 {} \;



# Create the database

echo "Creating database $DB_NAME..."

mysql -u root -p"$MYSQL_ROOT_PASSWORD" -e "CREATE DATABASE IF NOT EXISTS $DB_NAME;"



# Create a new Apache configuration for the project

echo "Creating Apache configuration for Bedrock"

sudo bash -c "cat > $APACHE_CONF <<EOL



<VirtualHost *:80>

ServerName "$PROJECT_NAME".local

DocumentRoot "$PROJECT_DIR"/web



<Directory "$PROJECT_DIR"/web>

Options Indexes FollowSymLinks

AllowOverride All

Require all granted

</Directory>



ErrorLog /var/log/apache2/"$PROJECT_NAME"-error.log

CustomLog /var/log/apache2/"$PROJECT_NAME"-access.log combined

</VirtualHost>

EOL"



# Give www-data permissions to write to /var/log/apache2/ directory

sudo usermod -a -G adm www-data



# Enable the new site and required modules

echo "Enablind the new site and required Apache modules..."

sudo a2ensite "$PROJECT_NAME".conf

sudo a2enmod rewrite



# Add the project to /etc/hosts if it doesn't exist

echo "Adding $PROJECT_NAME.local to /etc/hosts..."

if ! grep -q "$PROJECT_NAME.local" /etc/hosts; then

sudo bash -c "echo '127.0.0.1 $PROJECT_NAME.local' >> /etc/hosts"

fi



# Reload Apache for changes to take effect

systemctl reload apache2



echo -e "${GREEN}$PROJECT_NAME setup completed! You can access it at http://$PROJECT_NAME.local${RESET}"

https://redd.it/1g2qdqk
@r_bash

Missing Alias??

hey, need help ☹️

so about a year ago, i remember setting up an alias that would take "docker" and replace it with "DOCKER_DEFAULT_PLATFORM=linux/amd64 docker-compose build" because i was getting annoyed and it saved me a ton of time.

the problem now, is that im starting to use docker again, and i cant find that alias declared anywhere. its not in .bashrc, .zshrc, .bash_profile, .profile,


i cant find it using grep (too many files, not enough CPU)


i need help. honestly its not a huge deal just spelling it wrong and then correcting it, but i need to find out where this thing is. is there any sort of log that will show everything executed on my machine? ive already tried recording with noscript shell_activity too. no results.

https://redd.it/1g2yth1
@r_bash

I accidentally created a bunch of ~ signs - how do I delete them?
https://redd.it/1g36w4k
@r_bash

presenting `plock` - a *very* efficient pure-bash alternative to `flock` that implements locking

## [LINK TO CODE ON GITHUB](https://github.com/jkool702/misc-public-noscripts/blob/main/plock.bash)

plock uses shared anonymous pipes to implement locking *very* efficiently. Other than bash, its only dependencies are `find` and that you have procfs available at `/proc`

## USAGE

First source the plock function

. /path/to/plock.bash

Next, you open a file denoscriptor to a shared anonymous pipe using one of the following commands. Note: these will set 2 variables in your shell: PLOCK_ID and PLOCK_FD

plock -i # this initializes a new anonymous pipe to use and opens file denoscriptors to it
plock -p ${ID} # this joins another processes existing shared anonymous pipe (identified by $ID, the pipe's inode) and opens file denoscriptors to it

To access whatever resource is in question exclusively, you use the following. This sequence can be repeated as needed. Note: To ensure exclusive access, all processes accessing the file must use this plock method (this is also true with `flock`)

plock # get lock
# < do stuff with exclusive access >
plock -u # release lock

Finally, to close the file denoscriptor to the shared anonymous pipe, run

plock -c

See the documentation at the top of the `plock` function for alternate/long flag names and for info on some additional flags not shawn above.

## What is locking?

Running code with multiple processes can speed it up tremendously. Unfortunately, having multiple processes access/modify some file or some computer resource at the same exact moment results in bad things occuring.

This problem is often solved via "locking". prior to accessing the file/resource in question, each process must aquire a lock and then release said lock after they finished their access. This ensures only one process accesses the given file/resource at any given time. `flock` is commonly used to implement this.

## How `plock` works

`plock` re-implements locking using a shared anonymous pipe with a single byte of data (a newline) in its buffer.

* You aquire the lock by reading from the pipe (emptying its buffer and causing other processes trying to read from the pipe to get blocked until there is data).
* You release the lock by writing a single newline back into the shared anonymous pipe.

This process is very efficient, and has some nice properties, including that blocked processes will sit idle, automatically queue themselves, and will automatically unblock when they aquire the lock without needing active polling. It also makes the act of aquiring or relesing a lock almost instant - on my system it takes on average about 70 μs to aquire or release a lock.

***

Questions? Comments? Suggestions? Bug reports? Let me know!

Hope some of you find this useful!

https://redd.it/1g39i1q
@r_bash

any help in making this animation lighter and faster but still using the tput commands to set the lines and columns is welcomed.

#!/bin/bash
LINES=$(tput lines)
COLUMNS=$(tput cols)
for (( i=0; i<$LINES; i++ ))
do
clear
for (( l=0; l<=$i; l++ ))
do
echo
done
eval printf %.1s '$((RANDOM & 1))'{1..$COLUMNS}; echo
sleep 0.01
done

https://redd.it/1g3atap
@r_bash

Wildcards don't work when executing noscript as a program

Hello. I've been going mad trying to figure out exactly why my Bash noscript for batch encoding videos in FFmpeg doesn't recognize wildcards as such when I run it as a program. Filename for the noscript is "batch.sh", and I am running it in a directory where I have video files I want to re-encode. Here's what I've got for the noscript:

#!/bin/sh -efu

for i in .mkv;
do
ffmpeg \
-i "$i" \
-c:v libx265 \
-c:a copy \
-dn -attach "${i%.}.png" \
-metadata:s:t mimetype=image/png \
-metadata:s:t filename=cover.png \
"${i%.} (1).mkv"
done

When I run the noscript by itself:

batch.sh

I get these errors:

[in#0 @ 0x5aaf0d6a7700] Error opening input: No such file or directory
Error opening input file .mkv.
Error opening input files: No such file or directory

However, when I run the noscript as follows:

bash batch.sh

the wildcards are recognized, and the videos get converted as they should.

I am new to all this, and I simply fail to understand exactly what's going wrong here.

https://redd.it/1g3u9fn
@r_bash

Navita - A new Directory Jumper Utility

https://i.redd.it/mgprurmfdxud1.gif



https://redd.it/1g47ujl
@r_bash

while loop through grep matches - enters loop despite no matches?

#!/bin/bash

# create text file that does NOT contain string 'error'
echo -e "foo\nbar\nbaz" > ./OUTPUT.txt
#echo -e "foo\nerror logged\nbaz" > ./OUTPUT.txt

# while loop enters regardless?
while read -r error; do
COMPILATIONERROR=true
echo "error:$error"
done <<< "$(grep "error" OUTPUT.txt)"

if [ "$COMPILATIONERROR" = true ]; then
exit 1
fi

i'm trying to parse a text file of compilation output for specific error patterns. i've created a simplified version of the file above.

i've been using grep to check for the patterns via regex, but have removed the complexity in the example above - just a simple string match demonstrates my problem. basically it seems that grep will return one 'line' that the while loop reads through, even when grep finds no match. i want the while loop to not enter at all in that scenario.

i'm not tied to grep/this while loop method to achieve an equivalent result (echo out each match in a format of my choice, and exit 1 after if matches were found). am a bash idiot and was led down this root via google!

thanks <3

https://redd.it/1g4baiz
@r_bash