irnetd: 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/irnetd - from package: irda-utils

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

On Debian possible default full paths are:

/usr/sbin/irnetd - from package: irda-utils

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

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