Vá: awk FIELDWIDTHS howto?

["Paul Csanyi" <csanyipal@gmail.com>]

2008/1/9, judd@wadsworth.org <judd@wadsworth.org>:
> On  9 Jan, Sergio Cuéllar Valdés wrote:
>
> > 2008/1/9, Paul Csanyi <csanyipal@gmail.com>:
> >> 2008/1/9, Sergio Cuéllar Valdés <herrsergio@gmail.com>:
> >> > 2008/1/9, Paul Csanyi <csanyipal@gmail.com>:
> >>
> >> > > I try to use awk to print second field from a text file
> >> > > but awk prints a part of 1. field as a 2. field. Why?
> >> > >
> >> > > aptitude search ~i | awk '{ NF = "2" } { FIELDWIDTHS = " 4 32 " }
> >> > > {print $2}' > foltelepitett_debian_csomagok
> >> > >
> >> > > less foltelepitett_debian_csomagok
> >> > >
> >> > > ..
> >> > > bsdmainutils
> >> > > bsdutils
> >> > > busybox
> >> > > A
> >> > > ca-certificates
> >> > > checksecurity
> >>
> >> A record is like these:
> >>
> >> i busybox - Tiny utilities for small and embedded syst
> >> i A bzip2 - high-quality block-sorting file compressor
> >>     |
> >> 1234123456789etc.
> >> 1.  |2.
> >>
> >> I try to get only the package name from the 2. field.
> >>
> >> FIELDWIDTHS = " 4 32 "
> >>
> >> The given width for 1. field (4) should be right, but isn't.
> >> Awk give me the letter "A" as a 2. field. Why?
> >>
>
> It seem that gawk is behaving weirdly when using FIELDWIDTHS.  It splits
> the input line into one less field that the number given.
>
> Is this a bug that should be reported?  Try this:

I don't know.

> $ aptitude search ~i | awk 'BEGIN {FIELDWIDTHS="4 32 1"} {print $2}' | head
> acpi
> adduser
> alsa-base
> alsa-utils
> amarok
> amarok-engines
> amarok-xine
> apt
> apt-build
> apt-doc

Thank you!

-- 
Regards, Paul Csanyi
http://www.freewebs.com/csanyi-pal/index.htm