synergyc: 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/synergyc - from package: synergy

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

On Debian possible default full paths are:

/usr/bin/synergyc - from package: synergy

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

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