knemo: 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/knemo - from package: knemo

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

On Debian possible default full paths are:

/usr/bin/knemo - from package: knemo

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

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