trang: command not found

Have You tried accessing the binary with the full path?

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/bin/trang - from package: trang

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