reprocmd: 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/sbin/reprocmd - from package: resiprocate-repro

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

On Debian possible default full paths are:

/usr/sbin/reprocmd - from package: repro

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

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