hexcurse: 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/hexcurse - from package: hexcurse

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

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