zeya: 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 Debian possible default full paths are:

/usr/bin/zeya - from package: zeya

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