simulavr-disp: 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/simulavr-disp - from package: simulavr

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

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