smix: 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/smix - from package: siggen

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

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