ir-keytable: 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/ir-keytable - from package: v4l-utils

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

On Debian possible default full paths are:

/usr/bin/ir-keytable - from package: ir-keytable

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

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