kjs: 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/kjs - from package: kdelibs

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

On Debian possible default full paths are:

/usr/bin/kjs - from package: kdelibs-bin

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

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