mysql-workbench: 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/mysql-workbench - from package: mysql-workbench

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

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