salt-syndic: 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/salt-syndic - from package: salt-syndic

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

On Debian possible default full paths are:

/usr/bin/salt-syndic - from package: salt-syndic

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

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