grisbi: 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/grisbi - from package: grisbi

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

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