fileroot: 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

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/fileroot - from package: wcstools

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