cidupdate: 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 CentOS possible default full paths are:

/usr/bin/cidupdate - from package: ncid

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