ann_test: 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/ann_test - from package: ann-tools

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

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