repoclosure: 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/repoclosure - from package: yum-utils

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

On Debian possible default full paths are:

/usr/bin/repoclosure - from package: yum-utils

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

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