quelcom: 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/quelcom - from package: quelcom

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

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