nvi.recover: 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/nvi.recover - from package: nvi

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

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