sarg: 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/sarg - from package: sarg

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

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