olwm: 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 - from package: olwm

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

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