hoogle: 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/hoogle - from package: hoogle

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