quotasync: 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/quotasync - from package: quota

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

On Debian possible default full paths are:

/usr/bin/quotasync - from package: quota

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

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