mvs: 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/mvs - from package: libwww-mediawiki-client-perl

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

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