git-cache-proxy: 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/git-cache-proxy - from package: chiark-scripts

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

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