qwo: 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/qwo - from package: qwo

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

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