branch: 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/branch - from package: rheolef

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

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