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Silly little bash scripts I use on desktop

I figured I would toss some very smol scripts that I use often enough on *nix machines here. These are pretty silly/mostly not used for work or anything like that, but you may find them uselful enough. I will add more here as they are created. Most of these live at this github repo currently:

my random linux scripts repository

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If I am working in a headless environment and need to generate a password for a configuration or something, I like to lean on /dev/urandom to generate one strong and pseudorandom enough using this script:

echo "How many characters do you want in your string?" 

read strlen

echo "Include special characters? [y/n]"

read char
if [[ $char == y ]]; then
   cat /dev/urandom | tr -dc 'a-zA-Z0-9~@#$%^&*()-_=+[{]}\:;<,>.?/' | fold -w $strlen | head -n 1
else
   cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w $strlen | head -n 1
fi

Small oneliner to find Raspberry Pis on a network. Note: this will require you to change the CIDR notation in the line in order to fit your network mask. It will also not work on Pis that are using

spoofed MAC addresses and so on:

sudo nmap -sP 192.168.1.0/24 | awk '/^Nmap/{ip=$NF}/B8:27:EB/{print ip}'

Speaking of Pis, here is a script I use to check the temperature of an arm device while in terminal. This takes the CPU temp in millicelsius by default, so here it is converted into standard celsius. You will get the current temp printed out every second after execution:

while true;
do
    temp=$(</sys/class/thermal/thermal_zone0/temp);
    echo "$((temp/1000)) c";
    sleep  1;
done

If you want to play a quick physical game, maybe DND type situation, and don't have any dice on you but are near a laptop, you are in luck! The following will ask you how many dice you want to roll and then randomize the resutls of the roll. You can cahnge the "1-6" bit to "1-12" for your twelve-sided-die, et. (should probably just add that as another read option):

echo "How many dice do you want to roll?"

read rolls
printf "~~~~~~~~~~~~~~~~\nRolling bones...\n~~~~~~~~~~~~~~~~\n"

for i in $(seq $rolls)
do
  tr -cd '1-6' < /dev/urandom | head -c 1; echo
done

Okay, fine, this one is a Python script, but its maybe worth sharing for all you other indecisive movie watchers out there. This will walk through the directory in the script looking for common video file-types and select a random video file to start playing in VLC. Stop browsing and just watch soemthing! Note: you might obviously want to change/add file-types, change directory path, and even open in something like mpv as an alternative application:

import glob
import random
import subprocess

files = glob.glob('/media/**/*.mp4') + glob.glob('/media/**/*.mkv') + glob.glob('/media/**/*.avi')

play = random.choice(files)
subprocess.run(["vlc", play, "–fullscreen"])

Oh, but maybe one of your video files is corrupted or got botched during download? You can use this script, which utilizes ffmpeg, to list corruted files in a directory of your choosing:

read -e -p "Enter the directory path: " directory
if [ ! -d "$directory" ]; then
  echo "Directory does not exist."
  exit 1
fi

for file in "$directory"/*; do
  # Check against common video file extensions
  if [[ -f "$file" && ( "$file" =~ \.mp4$ || "$file" =~ \.mkv$ || "$file" =~ \.avi$ ) ]]; then
    # Use ffprobe to check each file's integrity
    ffprobe -v error -show_format -show_streams "$file" > /dev/null 2>&1

    # Check the exit status of ffprobe to determine if each file is corrupt or incomplete
    if [ $? -ne 0 ]; then
      echo "Corrupted or incomplete file: $file"
    fi
  fi
done