edif2vhdl: 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/edif2vhdl - from package: dgc

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

Error in other languages:
edif2vhdl: bevel nie gevind nie
edif2vhdl: comandă negăsită
edif2vhdl: comando não encontrado
edif2vhdl: commande introuvable
edif2vhdl: command not found
edif2vhdl: käsku ei ole
edif2vhdl: không tìm thấy lệnh
edif2vhdl: komanda nerasta
edif2vhdl: Kommando nicht gefunden.
edif2vhdl: kommandot finns inte
edif2vhdl: komut yok
edif2vhdl: nie znaleziono polecenia
edif2vhdl: níor aimsíodh an t-ordú
edif2vhdl: no se encontró la orden
edif2vhdl: no s'ha trobat l'ordre
edif2vhdl: opdracht niet gevonden
edif2vhdl: parancs nem található
edif2vhdl: perintah tidak ditemukan
edif2vhdl: príkaz nenájdený
edif2vhdl: příkaz nenalezen
edif2vhdl: команда не найдена
edif2vhdl: командата не е открита
edif2vhdl: 命令找不到
edif2vhdl: コマンドが見つかりません