xsysinfo: 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/xsysinfo - from package: xsysinfo

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

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