[CentOS] Log File Reviewing

William L. Maltby CentOS4Bill at triad.rr.com
Mon Jan 5 21:03:32 UTC 2009


On Mon, 2009-01-05 at 13:40 -0700, Joseph L. Casale wrote:
> >to match one or more, use + instead of *.
> >
> >* matches 0 or more, + matches 1 or more.
> 
> Thanks!
> <snip>

> So gawk does all that sed does and more? I suppose I can start with

Tons. You can write fairly complex programs with (g)awk. It can combine
command line expressions, scripts from files, has formatted print
capability, conditional execution, multiple regex selection capabilities
and mode.

A read of the man page would give you a lot of insight. Think of perl in
an earlier form. The original awk was probably what inspired perl. That
would be my guess.

Since (g)awk is regex based, what you learn for sed, vi(m), etc. is
easily transferred into (g)awk, and vice-versa, to a limited degree.

> that in this case, I always wanted a book on regexe's so I think I
> am going to order O'Reilly's Mastering Regular Expressions, Third Edition.
> They also have a sed & awk, Second Edition book, but its 10+ years old,
> does that matter, has sed/awk changed any since then?

The man pages will allow you to keep up easily once the fundamentals are
in place. Of course, frequency of use affects that greatly.

> 
> Thanks everyone!
> jlc
> <snip>

-- 
Bill



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