dtestcm: 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 CentOS possible default full paths are:

/usr/bin/dtestcm - from package: dapl-utils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/dtestcm - from package: dapl2-utils

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

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