irman2lirc: 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/irman2lirc - from package: lirc

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

On Debian possible default full paths are:

/usr/bin/irman2lirc - from package: lirc

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

Error in other languages:
irman2lirc: bevel nie gevind nie
irman2lirc: comandă negăsită
irman2lirc: comando não encontrado
irman2lirc: commande introuvable
irman2lirc: command not found
irman2lirc: käsku ei ole
irman2lirc: không tìm thấy lệnh
irman2lirc: komanda nerasta
irman2lirc: Kommando nicht gefunden.
irman2lirc: kommandot finns inte
irman2lirc: komut yok
irman2lirc: nie znaleziono polecenia
irman2lirc: níor aimsíodh an t-ordú
irman2lirc: no se encontró la orden
irman2lirc: no s'ha trobat l'ordre
irman2lirc: opdracht niet gevonden
irman2lirc: parancs nem található
irman2lirc: perintah tidak ditemukan
irman2lirc: príkaz nenájdený
irman2lirc: příkaz nenalezen
irman2lirc: команда не найдена
irman2lirc: командата не е открита
irman2lirc: 命令找不到
irman2lirc: コマンドが見つかりません