gvfs-monitor-file: 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-monitor-file - from package: gvfs

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

On Debian possible default full paths are:

/usr/bin/gvfs-monitor-file - from package: gvfs-bin

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

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