wavtool-pl: command not found

Have You tried accessing the binary with the full path?

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/wavtool-pl - from package: wavtool-pl

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