eindent: command not found

Have You tried accessing the binary with the full path?

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:

/lib/rc/bin/eindent - from package: openrc

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