scfg_test: 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/scfg_test - from package: speech-tools

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

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