wmanager: 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/wmanager - from package: wmanager

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

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