git2gv: 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/git2gv - from package: ruby-graphviz

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

Error in other languages:
git2gv: bevel nie gevind nie
git2gv: comandă negăsită
git2gv: comando não encontrado
git2gv: commande introuvable
git2gv: command not found
git2gv: käsku ei ole
git2gv: không tìm thấy lệnh
git2gv: komanda nerasta
git2gv: Kommando nicht gefunden.
git2gv: kommandot finns inte
git2gv: komut yok
git2gv: nie znaleziono polecenia
git2gv: níor aimsíodh an t-ordú
git2gv: no se encontró la orden
git2gv: no s'ha trobat l'ordre
git2gv: opdracht niet gevonden
git2gv: parancs nem található
git2gv: perintah tidak ditemukan
git2gv: príkaz nenájdený
git2gv: příkaz nenalezen
git2gv: команда не найдена
git2gv: командата не е открита
git2gv: 命令找不到
git2gv: コマンドが見つかりません