hfind: 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/hfind - from package: sleuthkit

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