horde-vfs: 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/horde-vfs - from package: php-horde-Horde-Vfs

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

On Debian possible default full paths are:

/usr/bin/horde-vfs - from package: php-horde-vfs

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

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