fastasplit: 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/fastasplit - from package: exonerate

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

On Debian possible default full paths are:

/usr/bin/fastasplit - from package: exonerate

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

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