wavinfo: 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/wavinfo - from package: wavbreaker

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

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