kni_keycontrol: 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/kni_keycontrol - from package: libkni3-examples

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

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