NAME¶

bashreadline.bt - Print bash commands system wide. Uses bpftrace/eBPF.

SYNOPSIS¶

bashreadline.bt

DESCRIPTION¶

bashreadline traces the return of the readline() function using uretprobes, to show the bash commands that were entered interactively, system wide. The entered command may fail: this is just showing what was entered.

This program is also a basic example of bpftrace and uretprobes.

Since this uses BPF, only the root user can use this tool.

REQUIREMENTS¶

CONFIG_BPF and bpftrace.

EXAMPLES¶

Trace bash commands system wide:

# bashreadline.bt

FIELDS¶

TIME

A timestamp on the output, in "HH:MM:SS" format.

PID

The process ID for bash.

COMMAND

Entered command.

OVERHEAD¶

As the rate of interactive bash commands is expected to be very low (<<100/s), the overhead of this program is expected to be negligible.

SOURCE¶

This is from bpftrace.

https://github.com/iovisor/bpftrace

Also look in the bpftrace distribution for a companion _examples.txt file containing example usage, output, and commentary for this tool.

This is a bpftrace version of the bcc tool of the same name. The bcc tool may provide more options and customizations.

https://github.com/iovisor/bcc

OS¶

Linux

STABILITY¶

Unstable - in development.

AUTHOR¶

Brendan Gregg

SEE ALSO¶

opensnoop.bt(8)