stoyanovgeorge

#!/bin/bash

range=500
number=$RANDOM
let "number %= $range"
printf "Random number less than %s - %s\n" "$range" "$number"

stoyanovgeorge

#!/bin/bash

# check if the $1 is empty
if [[ -z "$1" ]];then
    printf "Please define the IP or the hostname which you want to check!\nUsage: ./script.sh 192.168.1.1\n" 
else
    if ping -c 1 "$1" &> /dev/null;then
        printf "%s is UP!\n" "$1"
    else
        printf "%s is DOWN!\n" "$1"

stoyanovgeorge

#!/bin/bash

if [[ "$var" =~ ^-?[0-9]+$ ]];then
        echo "integer"
else
        echo "not integer"
fi

stoyanovgeorge

md5sum * | sort -k1 | uniq -w 32 -d

stoyanovgeorge

#!/bin/bash

bkp_dir="$HOME/backup"
now="$(date +'%Y%m%d')"

tar cfJ $HOME/backup/"${now}"_scripts.tar.xz "$HOME"/scripts/ &> /dev/null

# Evaluates the md5sum of the most recent backup and compares its md5sum against the other files in the same directory. If the md5sum is the same removes the duplicated file
md5sum_now=$(md5sum "$bkp_dir"/"${now}"_scripts.tar.xz | awk '{ print $1 }')

stoyanovgeorge

#!/bin/bash

# Creating an array containing all network interfaces which are up
net_array=()
for iface in $(ifconfig | cut -d ' ' -f1| tr ':' '\n' | awk NF)
do
        net_array+=("$iface")
done
unset "net_array[${#net_array[@]}-1]"

stoyanovgeorge

#!/bin/bash

stream=""
recording_dir=$HOME/recordings

while [[ ! $stream =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9] ]];
do
    echo "Please enter a valid multicast address and port in the format: IP.AD.DR.ESS:PORT after the script name!"
    read -r stream
done

stoyanovgeorge

#!/bin/bash

target_dir=""
bkp_dir=""

while [[ ! $bkp_dir =~ [a-zA-Z] && ! -d "$bkp_dir" ]];
do
    echo "Please enter a valid directory to backup:"
    read -r bkp_dir
done

stoyanovgeorge

#!/bin/bash

n='([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
m='([0-9]|[12][0-9]|3[012])'

IFS= read -rp 'Input: ' ipaddr

if [[ $ipaddr =~ ^$n(\.$n){3}/$m$ ]]; then
    printf '"%s" is a valid CIDR\n' "$ipaddr"
elif [[ $ipaddr =~ ^$n(\.$n){3}$ ]]; then

stoyanovgeorge

#!/bin/bash

if [ -e "$1" ] && [ -e "$2"  ];
then
  if file "$1" | grep -qE 'image|bitmap' && file "$2" | grep -qE 'image|bitmap' ;
  then
    ffmpeg -loglevel error -i "$1" -i "$2" -lavfi psnr=psnr.log -f null -
    cat psnr.log
    rm psnr.log
  else