p12topem.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/sympa/bin/p12topem.pl - from package: sympa

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

Error in other languages:
p12topem.pl: bevel nie gevind nie
p12topem.pl: comandă negăsită
p12topem.pl: comando não encontrado
p12topem.pl: commande introuvable
p12topem.pl: command not found
p12topem.pl: käsku ei ole
p12topem.pl: không tìm thấy lệnh
p12topem.pl: komanda nerasta
p12topem.pl: Kommando nicht gefunden.
p12topem.pl: kommandot finns inte
p12topem.pl: komut yok
p12topem.pl: nie znaleziono polecenia
p12topem.pl: níor aimsíodh an t-ordú
p12topem.pl: no se encontró la orden
p12topem.pl: no s'ha trobat l'ordre
p12topem.pl: opdracht niet gevonden
p12topem.pl: parancs nem található
p12topem.pl: perintah tidak ditemukan
p12topem.pl: príkaz nenájdený
p12topem.pl: příkaz nenalezen
p12topem.pl: команда не найдена
p12topem.pl: командата не е открита
p12topem.pl: 命令找不到
p12topem.pl: コマンドが見つかりません