push: 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/sbin/push - from package: heimdal-clients
/usr/lib/debug/usr/sbin/push - from package: heimdal-dbg

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

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