twinwave: 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/twinwave - from package: gtkwave

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

On Debian possible default full paths are:

/usr/bin/twinwave - from package: gtkwave

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

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