mlcat: 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/mlcat - from package: svtools

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

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