Bash how to store in a variable the result of a linux command?

Question

I'm trying to store in a variable the temperature of the computer. I tried this but it doesn't work:

#!/bin/bash
temp = cat "/sys/class/thermal/thermal_zone0/temp"
echo "$temp"

i tried this too:

#!/bin/bash
temp = $(cat "/sys/class/thermal/thermal_zone0/temp")
echo "$temp"

but nothing works, it always says

./temp.sh: line 2: temp: command not found

Answer 1

Spaces are crucial! This works fine:

# NO space around `=`
temp=$(cat "/sys/class/thermal/thermal_zone0/temp")
echo "$temp"