korgac: 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/korgac - from package: kdepim

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

On Debian possible default full paths are:

/usr/bin/korgac - from package: korganizer

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

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