certmaster-getcert: 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/certmaster-getcert - from package: certmonger

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

On Debian possible default full paths are:

/usr/bin/certmaster-getcert - from package: certmonger

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

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