fastasoftmask: 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/fastasoftmask - from package: exonerate

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

On Debian possible default full paths are:

/usr/bin/fastasoftmask - from package: exonerate

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

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