flip: 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/flip - from package: flip

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

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