fastareformat: 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 CentOS possible default full paths are:

/usr/bin/fastareformat - from package: exonerate

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/fastareformat - from package: exonerate

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

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