Decharger: command not found

Have You tried accessing the binary with the full path?

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/Decharger - from package: topp

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