prsync: command not found

Have You tried accessing the binary with the full path?

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/prsync - from package: pssh

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