simfsm: command not found

Have You tried accessing the binary with the full path?

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/simfsm - from package: dgc

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