hal-set-property: 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/hal-set-property - from package: hal

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

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