wavemon: 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/wavemon - from package: wavemon

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

On Debian possible default full paths are:

/usr/bin/wavemon - from package: wavemon

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

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