mltail: 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/mltail - from package: svtools

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

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