mf-nowin: 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 CentOS possible default full paths are:

/usr/bin/mf-nowin - from package: texlive-utils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mf-nowin - from package: texlive-binaries

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

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