fdflush software package provides Flush out-of-date disk buffers, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fdflush
fdflush is installed in your system.
Make ensure the fdflush package were installed using the commands given below,
$ sudo dpkg-query -l | grep fdflush *
You will get with fdflush package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Utilities |
| Package | fdflush |
| Version | 1.0.1.3+b1 [mips], 1.0.1.3 [i3 |
| Description | Flush out-of-date disk buffers |
| Sub Section | Utils |