killm: 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 Debian possible default full paths are:

/usr/bin/killm - from package: ion

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

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