mount.davfs: 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
/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:

/sbin/mount.davfs - from package: davfs2
/usr/sbin/mount.davfs - from package: davfs2

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

On Debian possible default full paths are:

/sbin/mount.davfs - from package: davfs2
/usr/sbin/mount.davfs - from package: davfs2

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