remsync: 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/remsync - from package: sharutils

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

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