dcadec: 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/dcadec - from package: libdca-utils

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

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