expired_delete.pl: 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/share/pnopaste/bin/expired_delete.pl - from package: pnopaste

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

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