emacs24: 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/emacs24 - from package: emacs24-lucid
/usr/bin/emacs24 - from package: emacs24-nox
/usr/bin/emacs24 - from package: emacs24

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

Error in other languages:
emacs24: bevel nie gevind nie
emacs24: comandă negăsită
emacs24: comando não encontrado
emacs24: commande introuvable
emacs24: command not found
emacs24: käsku ei ole
emacs24: không tìm thấy lệnh
emacs24: komanda nerasta
emacs24: Kommando nicht gefunden.
emacs24: kommandot finns inte
emacs24: komut yok
emacs24: nie znaleziono polecenia
emacs24: níor aimsíodh an t-ordú
emacs24: no se encontró la orden
emacs24: no s'ha trobat l'ordre
emacs24: opdracht niet gevonden
emacs24: parancs nem található
emacs24: perintah tidak ditemukan
emacs24: príkaz nenájdený
emacs24: příkaz nenalezen
emacs24: команда не найдена
emacs24: командата не е открита
emacs24: 命令找不到
emacs24: コマンドが見つかりません