psadwatchd: 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/psadwatchd - from package: psad

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

On Debian possible default full paths are:

/usr/sbin/psadwatchd - from package: psad

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

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