dwatch: 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/dwatch - from package: dwatch

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

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