knode: 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/knode - from package: kdepim

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

On Debian possible default full paths are:

/usr/bin/knode - from package: knode

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

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