How to output a snippet from a text file in BASH?

Question

linux

I've been sitting for 5 hours now and I can't even come up with an algorithm by which this script would work.
I ask for your help)
The task itself:
The script outputs a fragment of a file coming to the standard input. The fragment is specified as a rectangular block with the specified coordinates in symbols (from 0). The command line specifies the upper left corner of the block and the lower right. First the line number, then the column. Do not use the cut command!
Example:
$ cat example.txt
The priest had a dog,
he loved it.
She ate a piece of meat.
He killed her.
$./myscript.sh 1 3 3 7 < example.txt
her lyu
ate
her ub

Answer 1

myscript.sh

#!/usr/bin/env bash

x1=$1; y1=$2
x2=$3; y2=$4
x=0
while read line
do
  if (( $x >= $x1 && $x <= $x2 )); then
    echo "${line:$y1:$[y2-y1+1]}"
  fi
  x=$[x+1]
done

rough version, if desired, you can optimize

Answer 2

#! /bin/sh

TOP=$(($1 + 1))
BOT=$(($3 + 1))

LEFT=$2
WIDTH=$(($4 - $2 + 1))

sed -n "$TOP,$BOT s/.\{0,$LEFT\}\(.\{0,$WIDTH\}\).*$/\1/p"

$ ./win.sh 1 3 3 7
У попа была собака,
Он её любил.
Она съела кусок мяса.
Он её убил.
её лю
 съел
её уб
$

Answer 3

Substring Extraction section https://www.tldp.org/LDP/abs/html/string-manipulat...
${string:position:length}
Easy as hell!

Answer 4

Dig from:
ps
It should be something like this, in the morning, as soon as I get to the laptop, I will say more precisely