weight: 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/weight - from package: biosquid

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

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