ircd: 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/sbin/ircd - from package: ircd-hybrid

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

On Debian possible default full paths are:

/usr/sbin/ircd - from package: ircd-irc2

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

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