Fpattern: 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/Fpattern - from package: ferret-vis

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

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