twofeat: 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/twofeat - from package: emboss

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

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