cidalias: 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/cidalias - from package: ncid

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

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