bristol: 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/bristol - from package: bristol

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

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