hp2100: 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/hp2100 - from package: simh

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

Error in other languages:
hp2100: bevel nie gevind nie
hp2100: comandă negăsită
hp2100: comando não encontrado
hp2100: commande introuvable
hp2100: command not found
hp2100: käsku ei ole
hp2100: không tìm thấy lệnh
hp2100: komanda nerasta
hp2100: Kommando nicht gefunden.
hp2100: kommandot finns inte
hp2100: komut yok
hp2100: nie znaleziono polecenia
hp2100: níor aimsíodh an t-ordú
hp2100: no se encontró la orden
hp2100: no s'ha trobat l'ordre
hp2100: opdracht niet gevonden
hp2100: parancs nem található
hp2100: perintah tidak ditemukan
hp2100: príkaz nenájdený
hp2100: příkaz nenalezen
hp2100: команда не найдена
hp2100: командата не е открита
hp2100: 命令找不到
hp2100: コマンドが見つかりません