fid: 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 Debian possible default full paths are:

/usr/bin/fid - from package: id-utils

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

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