fedmsg-irc: 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 CentOS possible default full paths are:

/usr/bin/fedmsg-irc - from package: fedmsg-irc

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/fedmsg-irc - from package: fedmsg-irc

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

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