kwave: 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/kwave - from package: kwave

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

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