trinity: 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/bin/trinity - from package: trinity

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

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