parrot_config: 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_config - from package: parrot-devel

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

On Debian possible default full paths are:

/usr/bin/parrot_config - from package: parrot-devel

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

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