Consider:
heightScaled=$(bc <<< $H*$S/1)
echo $heightScaled
45.0
Why am I getting 45.0 despite the same operations yielding 45 if used outside the script either interactively or piped into bc?
H is an int(30) and S is a float(1.5)
Here's my code:
S=$(awk '/monitor =/ {print $6}' ~/.config/hypr/config/monitor.conf)
H=$(hyprctl layers 2>/dev/null | awk '/waybar/ {print substr($7, 1, length($7)-1)}')
if [ -z $H ]; then
H=0
fi
heightScaled=$(bc <<< "$H*$S/1")
echo "$heightScaled"
As mentioned in a comment, the actual value of $S is 1.5\n1, presumably because monitor.conf contains two lines that match /monitor =/. So what you're actually executing is:
bc
30*1.5
1/1
The first line outputs 45.0 because you don't have /1 to convert it from floating point to integer, and the second line outputs 1. So you're setting heightScaled to two lines: 45.0\n1.
You need to figure out how to filter the result to just the line you really want when setting S. You could exit after the first match.
S=$(awk '/monitor =/ {print $6; exit}' ~/.config/hypr/config/monitor.conf)
echo $heightScaled should be 45.0 1 in Bash (after word splitting and echo squash the newline). Or 45.0 and 1 on two lines, in zsh.
echo "$heightScaled"