A simple shell script to monitor the temperatures in Linux

tempmon.sh

#!/usr/bin/env bash

# ============================================================================= #
# Copyright © 2026 Guiorgy                                                      #
#                                                                               #
# This program is free software: you can redistribute it and/or modify it under #
# the terms of the GNU General Public License as published by the Free Software #
# Foundation, either version 3 of the License, or (at your option) any later    #
# version.                                                                      #
#                                                                               #
# This program is distributed in the hope that it will be useful, but WITHOUT   #
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS #
# FOR A PARTICULAR PURPOSE.                                                     #
#                                                                               #
# You can see the full GNU General Public License at                            #
# <https://www.gnu.org/licenses/> for more details.                             #
# ============================================================================= #

read -r -d '' COMMANDS <<'EOF'
# Read temperatures from /sys/class/thermal/thermal_zone*

for zone in /sys/class/thermal/thermal_zone*; do
  temp_raw=$(cat "$zone/temp")
  type=$(cat "$zone/type")

  temp_int=$(( temp_raw / 1000 ))
  temp_dec=$(( (temp_raw - temp_int * 1000) / 100 ))
  temp="${temp_int}.${temp_dec}"

  printf "%-15s : %sC\n" "$type" "$temp"
done
EOF

watch -n "${1-2}" "$COMMANDS"