r10k: 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 Debian possible default full paths are:

/usr/bin/r10k - from package: r10k

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

Error in other languages:
r10k: bevel nie gevind nie
r10k: comandă negăsită
r10k: comando não encontrado
r10k: commande introuvable
r10k: command not found
r10k: käsku ei ole
r10k: không tìm thấy lệnh
r10k: komanda nerasta
r10k: Kommando nicht gefunden.
r10k: kommandot finns inte
r10k: komut yok
r10k: nie znaleziono polecenia
r10k: níor aimsíodh an t-ordú
r10k: no se encontró la orden
r10k: no s'ha trobat l'ordre
r10k: opdracht niet gevonden
r10k: parancs nem található
r10k: perintah tidak ditemukan
r10k: príkaz nenájdený
r10k: příkaz nenalezen
r10k: команда не найдена
r10k: командата не е открита
r10k: 命令找不到
r10k: コマンドが見つかりません