paco: 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/paco - from package: paco

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

On Debian possible default full paths are:

/usr/bin/paco - from package: paco

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

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