---
name: "rwbytype.d"
section: "1m"
platform: "macos"
package: "dtrace"
version: "413"
release: "macOS 26.5"
platforms: ["macos"]
url: "https://new.carta.tech/rwbytype.d"
---

# rwbytype.d(1m)

read/write bytes by vnode type. Uses DTrace.

## NAME

rwbytype.d - read/write bytes by vnode type. Uses DTrace.

## SYNOPSIS

**rwbytype.d**

## DESCRIPTION

This program identifies the vnode type of read/write activity - whether that is for regular files, sockets, character special devices, etc. This is measuring at the application level, so file activity may well be  cached by the system.

Since this uses DTrace, only users with root privileges can run this command.

## EXAMPLES

- This samples until Ctrl-C is hit.

  \#  **rwbytype.d**

## FIELDS

- PID

  process ID

- CMD

  process name

- VNODE

  vnode type (describes I/O type)

- DIR

  direction, Read or Write

- BYTES

  total bytes

## DOCUMENTATION

See the DTraceToolkit for further documentation under the  Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output.

## EXIT

rwbytype.d will sample until Ctrl-C is hit.

## AUTHOR

Brendan Gregg \[Sydney, Australia\]

## SEE ALSO

rwbypid.d(1M), rwbbypid.d(1M), dtrace(1M)