init: 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 CentOS possible default full paths are:

/sbin/init - from package: upstart

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/sbin/init - from package: systemd-sysv
/sbin/init - from package: sysvinit-core
/sbin/init - from package: upstart

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

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