rxterm: 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/rxterm - from package: heimdal-clients-x

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

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