watchquagga: 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/watchquagga - from package: quagga

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

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