I wrote it in Go so I could easily compile a version for each OS, like Linux, Windows or Mac (Darwin), and each CPU architecture like 32bit (386) or 64bit (amd64).

Just download the tool you need for your OS, and rename it to tcmd. The rename is not required, but I recommend it for consistency.

These are the versions:

Mac 32bit
Mac 64bit
Linux 32bit
Linux 64bit
Linux arm (Raspberry Pi)
Windows 32bit
Windows 64bit (most common)

Here's an example from my Raspberry Pi:

wget https://triggercmdagents.s3.amazonaws.com/tcmd_cli/tcmd-linux-arm
sudo mv tcmd-linux-arm /usr/local/tcmd
chmod +x /usr/local/tcmd
tcmd
No trigger specified.  Use --help or -h for help.

tcmd -h
NAME:
        tcmd - Run commands on computers in your TRIGGERcmd account
      USAGE:
        tcmd [options]
    
      OPTIONS:
        --trigger value, -t value   Trigger name of the command you want to run
        --computer value, -c value  Name of the computer (leave blank for your default computer)
        --params value, -p value    Any parameters you want to add to the remote command
        --panel value, -P value     Name of the panel you want to use
        --button value, -b value    Name of the panel button to "press"
        --list, -l                  List your commands
        --listpanels, -L            List your panels
        --pair                      Login using a pair code
        --help, -h                  show help
        --version, -v               print the version ds -t calculator

tcmd -c ds -t calculator
{"data":    {"user":"68bh2a75f2f63133334755d1","computer":"5a2f8be70f383803178e0dee","name":"Calculator","voice":"calculator","voiceReply":null,"allowParams":false,"runCount":24,"createdAt":"2018-03-30T22:59:35.862Z","updatedAt":"2018-06-23T15:48:04.031Z","id":"5abec157a745e8110063aa18"},"message":"Trigger sent."}

If you want to see the source code, check out https://github.com/rvmey/triggercmdGOclient

If you want to run the Linux version in Windows WSL, you'll want to copy your token.tkn file to your home folder like this:

mkdir ~/.TRIGGERcmdData
cp /mnt/c/Users/Russ/.TRIGGERcmdData/token.tkn ~/.TRIGGERcmdData/
tcmd -computer DS -trigger notepad -params russ.txt

EDIT 1/13/20: Now you can pass multiple parameters.
EDIT 2/4/20: Added a --list parameter to list possible tcmd commands.
EDIT 7/24/21: Added --pair parameter to use a pair code to get a token. FYI if you've installed the agent you already have a token.
EDIT 3/22/26: Added --tui parameter to open a Text User Interface. Also now you can authenticate using a TRIGGERCMD_TOKEN environment variable.