irpsion5: 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/irpsion5 - from package: irda-utils

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

On Debian possible default full paths are:

/usr/sbin/irpsion5 - from package: irda-utils

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

Error in other languages:
irpsion5: bevel nie gevind nie
irpsion5: comandă negăsită
irpsion5: comando não encontrado
irpsion5: commande introuvable
irpsion5: command not found
irpsion5: käsku ei ole
irpsion5: không tìm thấy lệnh
irpsion5: komanda nerasta
irpsion5: Kommando nicht gefunden.
irpsion5: kommandot finns inte
irpsion5: komut yok
irpsion5: nie znaleziono polecenia
irpsion5: níor aimsíodh an t-ordú
irpsion5: no se encontró la orden
irpsion5: no s'ha trobat l'ordre
irpsion5: opdracht niet gevonden
irpsion5: parancs nem található
irpsion5: perintah tidak ditemukan
irpsion5: príkaz nenájdený
irpsion5: příkaz nenalezen
irpsion5: команда не найдена
irpsion5: командата не е открита
irpsion5: 命令找不到
irpsion5: コマンドが見つかりません