gnomevfs-df: 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/gnomevfs-df - from package: gnome-vfs2

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

On Debian possible default full paths are:

/usr/bin/gnomevfs-df - from package: libgnomevfs2-bin

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

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