fastaexplode: 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/fastaexplode - from package: exonerate

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

On Debian possible default full paths are:

/usr/bin/fastaexplode - from package: exonerate

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

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