sfood-flatten: 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/sfood-flatten - from package: snakefood

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