How to print to logread?

Alexandr Didenko

I make myself program.
How to output/print to logread?

Maximilian Gerhardt

From https://wiki.openwrt.org/doc/howto/log.essentials:

Who logs? The syslogd acts as the server and any program can act as the client and send log messages to it. For example logger can be used to manually write messages to the system log. Some scripts in /etc/init.d/ actually use this.

In the Omega2's shell:

root@Omega-C465:~# logger -h
logger: unrecognized option: h
BusyBox v1.25.1 () multi-call binary.

Usage: logger [OPTIONS] [MESSAGE]

Write MESSAGE (or stdin) to syslog

        -s      Log to stderr as well as the system log
        -t TAG  Log using the specified tag (defaults to user name)
        -p PRIO Priority (numeric or facility.level pair)

When doing e.g.

root@Omega-C465:~# logger -t "myapp" "Hello World!"

Results in

root@Omega-C465:~# logread
[..]
Sun Jun 24 18:21:20 2018 user.notice myapp: Hello World!

Alexandr Didenko

@Maximilian-Gerhardt BIG THANKS!!!
Sorry.
And how to write to logread from python?

Maximilian Gerhardt

@Alexandr-Didenko

In Python2 you can just use the subprocess library to invoke a shell command as if you would type it in the shell. See https://stackoverflow.com/questions/89228/calling-an-external-command-in-python

from subprocess import call
call(["logger", "-t", "myapp", "my test message"])

Alexandr Didenko

@Maximilian-Gerhardt said in How to print to logread?:

from subprocess import call
call(["logger", "-t", "myapp", "my test message"])

THAAAAAAAAAANXXXX!!!!!!!!!

Mats Hallonstedt

@Alexandr-Didenko

There is an option to the "call" procedure when logging from Python:

import syslog

# Log messages to "LOCAL0" facility
syslog.openlog(facility=syslog.LOG_LOCAL0)

# Write something to the logfile
syslog.syslog(syslog.LOG_INFO, "This is a logged message")

syslog.closelog()

You may then filter these from the shell:

root@Omega:~# logread -l 800 | grep "local0"
Thu Dec 13 09:02:24 2018 local0.info log.py: This is a logged message

Ali Raza

@Mats-Hallonstedt : thanks buddy. I tried this first <a href="https://stackoverflow.com/questions/89228/calling-an-external-command-in-python" rel="nofollow">https://stackoverflow.com/questions/89228/calling-an-external-command-in-python</a> then <a href="https://droidspc.com/" rel="nofollow">https://droidspc.com/</a>