korganizer: 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/korganizer - from package: kdepim

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

On Debian possible default full paths are:

/usr/bin/korganizer - from package: korganizer

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

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