g15stats: 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/g15stats - from package: g15stats

You may install the required package with command apt-get install {package}
Error in other languages:
g15stats: bevel nie gevind nie
g15stats: comandă negăsită
g15stats: comando não encontrado
g15stats: commande introuvable
g15stats: command not found
g15stats: käsku ei ole
g15stats: không tìm thấy lệnh
g15stats: komanda nerasta
g15stats: Kommando nicht gefunden.
g15stats: kommandot finns inte
g15stats: komut yok
g15stats: nie znaleziono polecenia
g15stats: níor aimsíodh an t-ordú
g15stats: no se encontró la orden
g15stats: no s'ha trobat l'ordre
g15stats: opdracht niet gevonden
g15stats: parancs nem található
g15stats: perintah tidak ditemukan
g15stats: príkaz nenájdený
g15stats: příkaz nenalezen
g15stats: команда не найдена
g15stats: командата не е открита
g15stats: 命令找不到
g15stats: コマンドが見つかりません