tpad.zsh is a little script to control some various things on my ThinkPad laptop. Some of it will also work on other laptops, I guess? I don't know, I didn't try it. Tested on ThinkPad E585 (AMD Ryzen) and x270 (Intel Kaby Lake).

What you get:

% tpad.zsh
Charge:   BAT0: start=40 stop=75 current=93 capacity=91 status=Not charging
          BAT1: start=40 stop=75 current=51 capacity=87 status=Discharging remaining=02:22
CPU:      governor=powersave min_freq=400 max_freq=3900
Fan:      speed=0 level=auto
Thermal:  coretemp.package-id-0 = 44
          coretemp.core-1       = 44
          coretemp.core-0       = 44
          thinkpad.cpu          = 42
          acpitz                = 42
          pch_skylake           = 40
          iwlwifi_1             = 39
          nvme.2                = 34
          nvme.1                = 31
          nvme                  = 31
Knobs:    led-keyboard = 0     led-lid      = 0
          led-micmute  = 0     led-mute     = 0
          led-power    = 0     nmi-watchdog = 0
          vm-writeback = 1500

% tpad.zsh help
tpad.zsh controls some ThinkPad attributes.

Commands overview:
    help          Show help.
    status        Print status.
    save          Save current settings as a shell script.
    charge-limit  Set battery charge limits.
    cpu           Set CPU governor and frequency.
    monitor-fan   Dynamically adjust fan based on temperature.
    knob          Control various "knobs".

Use "help <cmd>" for more help for a command, or "help all" to list the
full help for all commands.

It's a thin layer over setting various things in /sys; a lot of other scripts/programs are super-complicated and abstract far too much IMO. I used TLP before, which really isn't all that bad, but I had some problems with it and it was quicker to figure out how Linux works and writing my own script than figuring out how TLP and what exactly the problem was 🤷

Requires zsh, awk, and Linux.