olwm-x-window-manager: 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/olwm-x-window-manager - from package: olwm

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

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