dlg: 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/dlg - from package: pccts

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

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