nfoview: 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/nfoview - from package: nfoview

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

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