aaflip: 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/aaflip - from package: aview

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

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