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Log Colorizers


See also

Recommended Links Recommended Papers Syslog MultiTail  
logtail Logrep loghound LogSurfer Humor Etc

Log Watcher

Perl tool
$Id: README,v 1.28 2004/12/15 08:27:46 arturcz Exp $
$Source: /cvsroot/lwatch/files/README,v $

Log Watcher - tool for log watching and colorize.

Regular expression support is provided by the PCRE library package,
which is an open source software, written by Philip Hazel, copyright
by the University of Cambridge, England.

PCRE library is available at:

This package uses autotools. You can change all paths and directories
running configure with proper options.
Path and directories changes should be propagated into documentation
and binary. If not, please submit a bug (see BUGS for details).

If you want to use CVS snapshot please read README.cvs.
Automake 1.8 is not necessary. You may safely ignore messages about the 
lack of it as long as, acinclude.m4 and are not

Log Watcher uses getopt_long function. Some unices have it included
in libc (specially glibc based ones), some have it in other libraries
and some do not have it. If you use one of the two last flavors of 
unices, please inform me how you compiled/linked lwatch.

In most cases (assuming, that you have the required libriaries)
    make install
should work. If not, you can set following environment variables:
 - CPPFLAGS specifies additional directories where headers files are searched
 - LDFLAGS specifies additional directories where libraries are searched
 - LIBS specifies additional libraries which lwatch should be linked with

If you have includes/libraries in non-standard directories there are two cases.
1) Header files are in /any/directory/include and libraries are in /any/directory/lib
   In this case just add --with-libFOO=/any/directory to ./configure, for example:
   ./configure --with-libpcre=/opt
2) Above is not true. Then you should specify proper directories manually with CPPFLAGS
   and LDFLAGS, for example
(for example):
   ./configure CPPFLAGS="-I/opt/include" LDFLAGS="-L/opt/lib" 

If you have non-standard library which contains (i.e.) getopt_long run:
./configure LIBS="-lgnugetopt"

Set also CPPFLAGS and LDFLAGS if needed

Default input file is /dev/lwatch. You can change it running:
configure --enable-input=/other/file
What do you think about adding proper entries into syslog/syslog-ng
configuration file during package installation?

If you add this piece of software into any distribution as a package do me
a favour and, please, send me an email notice about it. You can find my email
address in AUTHORS file.

Flex errors
If you get an error like:
"yparse.l", line 1: unrecognized '%' directive
"yparse.l", line 2: bad character: #
"yparse.l", line 2: unknown error processing section 1
"yparse.l", line 2: unknown error processing section 1
"yparse.l", line 2: bad character: "
"yparse.l", line 2: unknown error processing section 1
"yparse.l", line 2: bad character: .
"yparse.l", line 2: unknown error processing section 1
"yparse.l", line 2: bad character: "
"yparse.l", line 3: bad character: }
that means you have too old flex. Please upgrade before compilation.
2.5.31 works for me.

OS specific information

* Cygwin
Bartek Tomicki told me that lwatch compiles and runs on cygwin without any
problemes. You can contact him at [email protected]

* FreeBSD
Install libgnugetopt (1.2 works for me)
Use `gmake' instead of `make'

* OpenBSD
Aleksander Piotrowski  maintains an OpenBSD
port which is available on

* Linux on i386
No additional packages required.

* Linux on other architectures
No experiences. Feedback mostly welcomed.




System log colorizer

System log Colorizer prints out some useful information by filtering and colorizing syslog files. It allows you to read a file, a FIFO, or from stdin, and print out only interesting data. The script colorizes each part of a log line (date, host, process, PID, and message), allows processes to have different colors, and can highlight words in a specific color. It can also use a Perl regex for syntax colorization for variable parts of messages. It filters messages (globally or by host) on process name or/and a regex on the message.


loco is a Perl script which gives the messages file (usually /var/log/messages) some color, so the output is easier to read. It uses a Perl module called Term::ANSIColor to produce the colors. The Perl script is very readable and customizable. is a Perl script to colorize your system, Squid, Apache, oops, xfer, and many other logs with file, version, address, URL, email, user, service, etc. catch routines. HTML output support with "valid" HTML and CSS code is available.

logcoloriser (Console/Log Analyzers)

Ssyslog log colourising PERL script
Jul 31st 1999, 22:12
stable: 1.0.2 - devel: none - license: GPL



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