twinstar: 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 Debian possible default full paths are:

/usr/sbin/twinstar - from package: dahdi

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

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