tryton-client: 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/tryton-client - from package: tryton-client

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

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