terraintool: 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/bin/terraintool - from package: terraintool

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

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