sabredav: 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/share/doc/php-sabre-dav-1.8.12/bin/sabredav - from package: php-sabre-dav

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

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