vsys - Make AFS system calls from the command line


vsys <call number> <parms>+


vsys is a development tool to make AFS system calls from the command line. <call number> is the AFS system call to be invoked. <parms>+ are the values to pass to the system call. Knowledge of the AFS system call layer is required to know valid call numbers and parameters.


vsys is intended for debugging AFS at a low level and is therefore intended for AFS developers. System Administrators and AFS users should use the higher-level interfaces provided by fs(1), aklog(1), klog(1), and pagsh(1) instead.

vsys provides a way to pass arbitrary data into the AFS system call mechanism. Caution should be taken when using or providing this binary on a system, as incorrect use as a privileged user could cause a system to panic, hang, or perform an unsafe operation.


The issuer must be logged in as the local superuser root.


afsd(8), aklog(1), fs(1), klog(1), pagsh(1)


Copyright 2009 Steven Jenkins <>

This documentation is covered by the BSD License as written in the doc/LICENSE file. This man page was written by Steven Jenkins for OpenAFS.