dbar: 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/dbar - from package: dbar

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

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