vrename: 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/vrename - from package: perl-Verilog-Perl

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

On Debian possible default full paths are:

/usr/bin/vrename - from package: libverilog-perl

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

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