rpm2paco: 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/rpm2paco - from package: paco

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

On Debian possible default full paths are:

/usr/bin/rpm2paco - from package: paco

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

Error in other languages:
rpm2paco: bevel nie gevind nie
rpm2paco: comandă negăsită
rpm2paco: comando não encontrado
rpm2paco: commande introuvable
rpm2paco: command not found
rpm2paco: käsku ei ole
rpm2paco: không tìm thấy lệnh
rpm2paco: komanda nerasta
rpm2paco: Kommando nicht gefunden.
rpm2paco: kommandot finns inte
rpm2paco: komut yok
rpm2paco: nie znaleziono polecenia
rpm2paco: níor aimsíodh an t-ordú
rpm2paco: no se encontró la orden
rpm2paco: no s'ha trobat l'ordre
rpm2paco: opdracht niet gevonden
rpm2paco: parancs nem található
rpm2paco: perintah tidak ditemukan
rpm2paco: príkaz nenájdený
rpm2paco: příkaz nenalezen
rpm2paco: команда не найдена
rpm2paco: командата не е открита
rpm2paco: 命令找不到
rpm2paco: コマンドが見つかりません