---
name: "ktrdump"
section: "8"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/ktrdump"
---

# ktrdump(8)

print kernel ktr trace buffer

## NAME

**ktrdump** – print kernel ktr trace buffer

## SYNOPSIS

**ktrdump** \[**-cflqrtH**\] \[**-i** *ktrfile*\] \[**-M** *core*\] \[**-N** *system*\] \[**-o** *outfile*\]

## DESCRIPTION

The **ktrdump** utility is used to dump the contents of the kernel ktr trace buffer.

The following options are available:

- **-c**

  Print the CPU number that each entry was logged from.

- **-l**

  Poll the kernel ktr trace buffer periodically dumping any new events after each poll.

- **-f**

  Print the file and line number that each entry was logged from.

- **-q**

  Quiet mode; do not print the column header.

- **-r**

  Print relative timestamps rather than absolute timestamps.

- **-t**

  Print the timestamp for each entry.

- **-H**

  Print the thread ID for each entry.

- **-i** *ktrfile*

  File containing saved ktr trace events; for more information see the [ktr(4)](/ktr/4.md) manual page.

- **-N** *system*

  The kernel image to resolve symbols from. The default is the value returned via [getbootfile(3)](/getbootfile/3.md).

- **-M** *core*

  The core file or memory image to read from. The default is */dev/mem*.

- **-o** *outfile*

  The file to write the output to. The default is standard output.

## SEE ALSO

[ktr(4)](/ktr/4.md), [ktr(9)](/ktr/9.md)

## HISTORY

The **ktrdump** utility first appeared in FreeBSD 5.0.

## AUTHORS

The **ktrdump** utility was implemented by Jake Burkholder ⟨*jake@FreeBSD.org*⟩.

This manual page was written by Chad David ⟨*davidc@FreeBSD.org*⟩.