reposctl: 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/reposctl - from package: sblim-gather

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

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