rtlbrowse: 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/rtlbrowse - from package: gtkwave

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

On Debian possible default full paths are:

/usr/bin/rtlbrowse - from package: gtkwave

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

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