get-terminal-size.sh

#!/bin/bash
 
# src http://fnxweb.com/blog/2012/08/02/read-the-current-terminal-size-from-within-bash/
 
# Request size
stty -echo
echo -ne '\e[18t'
 
# Read size char. by char. (CSI 8 ; height ; width t)
width=
heigh=
p=0
while IFS= read -r -n1 char
do
  # Get past CSI
  if [[ "$p" == 0  &&  "$char" == ";" ]];  then
    p=$((p+1))
 
  # width
  elif [[ "$p" == 1  ]];  then
    [[ "$char" == ";" ]]  &&  p=$((p+1))  ||  height="${height}${char}"
 
  # height
  elif [[ "$p" == 2  ]];  then
    [[ "$char" == "t" ]]  &&  break  ||  width="${width}${char}"
 
  fi
done
 
# Done
stty echo

if [ "x$1" = "xstty" ]; then
	stty cols $width rows $height
else
	echo -e "width=$width\nheight=$height"
fi