dtpcadmin: 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/dtpcadmin - from package: ion

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

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