repoview: 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/repoview - from package: repoview

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

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