re.pl: command not found

Have You tried accessing the binary with the full path?

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/re.pl - from package: libdevel-repl-perl

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