fido: 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/sbin/fido - from package: fido

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