synergys: 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/synergys - from package: synergy

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

On Debian possible default full paths are:

/usr/bin/synergys - from package: synergy

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