Script to open multiple terminals in CentOS

open_terminals.sh

#!/bin/bash

# sample config (4x2 grid on a 3840x2160 screen)
screen_cols=424
screen_rows=116
screen_width=3840
screen_height=2160
grid_col_count=4
grid_row_count=2

declare -a dirs=(
  "~"
  "~"
  "~"
  "~"
  "~"
)

# script
scrollbar_cols=1
menubar_rows=2

terminal_width=$(($screen_width/$grid_col_count))
terminal_height=$(($screen_height/$grid_row_count))
terminal_cols=$((($screen_cols/$grid_col_count)-$scrollbar_cols))
terminal_rows=$((($screen_rows/$grid_row_count)-$menubar_rows))

for index in ${!dirs[@]}; do
  col_index=$(($index%$grid_col_count))
  row_index=$(($index/$grid_col_count))
  
  offset_x=$(($terminal_width*$col_index))
  offset_y=$(($terminal_height*$row_index))
  
  geometry="${terminal_cols}x${terminal_rows}+${offset_x}+${offset_y}"

  gnome-terminal --tab --geometry=$geometry --working-directory=${dirs[index]}
done