hsbrainfuck: 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/hsbrainfuck - from package: hsbrainfuck

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