thd: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/sbin/thd - from package: triggerhappy

You may install the required package with command apt-get install {package}

Error in other languages:
thd: bevel nie gevind nie
thd: comandă negăsită
thd: comando não encontrado
thd: commande introuvable
thd: command not found
thd: käsku ei ole
thd: không tìm thấy lệnh
thd: komanda nerasta
thd: Kommando nicht gefunden.
thd: kommandot finns inte
thd: komut yok
thd: nie znaleziono polecenia
thd: níor aimsíodh an t-ordú
thd: no se encontró la orden
thd: no s'ha trobat l'ordre
thd: opdracht niet gevonden
thd: parancs nem található
thd: perintah tidak ditemukan
thd: príkaz nenájdený
thd: příkaz nenalezen
thd: команда не найдена
thd: командата не е открита
thd: 命令找不到
thd: コマンドが見つかりません