htlogin: 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/lib/rancid/bin/htlogin - from package: rancid

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