mcview: 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/mcview - from package: mc

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

On Debian possible default full paths are:

/usr/bin/mcview - from package: mc

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

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