jwm: 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/jwm - from package: jwm

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

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