git: 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 CentOS possible default full paths are:

/usr/bin/git - from package: git

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/git - from package: git

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

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