irdadump: 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/irdadump - from package: irda-utils

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

On Debian possible default full paths are:

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

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

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