pirl: 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 Debian possible default full paths are:

/usr/bin/pirl - from package: libshell-perl-perl

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

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