synergy: 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/synergy - from package: synergy

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

On Debian possible default full paths are:

/usr/bin/synergy - from package: synergy

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

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