parrot-prove: 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/parrot-prove - from package: parrot-devel

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

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