run.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/doc/libpoet-perl/examples/blog/bin/run.pl - from package: libpoet-perl
/usr/share/perl5/auto/share/dist/Poet/generate.skel/bin/run.pl - from package: libpoet-perl

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

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