fahash: 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/fahash - from package: ncbi-epcr

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

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