gvfs-cat: 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/gvfs-cat - from package: gvfs

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

On Debian possible default full paths are:

/usr/bin/gvfs-cat - from package: gvfs-bin

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

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