zeyaclient: 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 Debian possible default full paths are:

/usr/bin/zeyaclient - from package: zeya

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

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