ipwatchd: 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/sbin/ipwatchd - from package: ipwatchd

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

On Debian possible default full paths are:

/usr/sbin/ipwatchd - from package: ipwatchd

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

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