rss2irc: 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/rss2irc - from package: rss2irc

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

Error in other languages:
rss2irc: bevel nie gevind nie
rss2irc: comandă negăsită
rss2irc: comando não encontrado
rss2irc: commande introuvable
rss2irc: command not found
rss2irc: käsku ei ole
rss2irc: không tìm thấy lệnh
rss2irc: komanda nerasta
rss2irc: Kommando nicht gefunden.
rss2irc: kommandot finns inte
rss2irc: komut yok
rss2irc: nie znaleziono polecenia
rss2irc: níor aimsíodh an t-ordú
rss2irc: no se encontró la orden
rss2irc: no s'ha trobat l'ordre
rss2irc: opdracht niet gevonden
rss2irc: parancs nem található
rss2irc: perintah tidak ditemukan
rss2irc: príkaz nenájdený
rss2irc: příkaz nenalezen
rss2irc: команда не найдена
rss2irc: командата не е открита
rss2irc: 命令找不到
rss2irc: コマンドが見つかりません