id: 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:

/usr/bin/id - from package: coreutils

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

On Debian possible default full paths are:

/usr/bin/id - from package: coreutils

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

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