awk FIELDWIDTHS howto?
Hello!
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
..
Any advices will be appreciated!
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Regards, Paul Csanyi
http://www.freewebs.com/csanyi-pal/index.htm
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Re: awk FIELDWIDTHS howto?
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
Hello!
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
Hello,
something like this: aptitude search ~i | cut -d -f2
does this help you ?
Best regards,
Sergio Cuellar
--
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Durch die Tage ohne Dich
Und die Liebe soll mich tragen
Wenn der Schmerz die Hoffnung bricht
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Vá: awk FIELDWIDTHS howto?
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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?
something like this: aptitude search ~i | cut -d -f2
does this help you ?
No.
--
Regards, Paul Csanyi
http://www.freewebs.com/csanyi-pal/index.htm
Re: Vá: awk FIELDWIDTHS howto?
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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?
something like this: aptitude search ~i | cut -d -f2
does this help you ?
No.
So, if you only need package name:
aptitude search ~i | cut -d -f3
Regards,
Sergio Cuellar
--
Meine Hoffnung soll mich leiten
Durch die Tage ohne Dich
Und die Liebe soll mich tragen
Wenn der Schmerz die Hoffnung bricht
Vá: Vá: awk FIELDWIDTHS howto?
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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 $2}' foltelepitett_debian_csomagok
less foltelepitett_debian_csomagok
..
bsdmainutils
bsdutils
busybox
A
ca-certificates
checksecurity
A record is like these:
i busybox - Tiny utilities for small and embedded syst
i A bzip2 - high-quality block-sorting file compressor
|
1234123456789etc.
1. |2.
I try to get only the package name from the 2. field.
FIELDWIDTHS = 4 32
The given width for 1. field (4) should be right, but isn't.
Awk give me the letter A as a 2. field. Why?
So, if you only need package name:
aptitude search ~i | cut -d -f3
It is cut, not awk.
Howewer, it is not god. The output file contains empty lines
besides of the package names.
--
Regards, Paul Csanyi
http://www.freewebs.com/csanyi-pal/index.htm
Re: Vá: Vá: awk FIELDWIDTHS howto?
2008/1/9, Paul Csanyi [EMAIL PROTECTED]: So, if you only need package name: aptitude search ~i | cut -d -f3 It is cut, not awk. Howewer, it is not god. The output file contains empty lines besides of the package names. No blank lines : aptitude search ~i | cut -d -f3 | sed '/^$/d' done yes, no awk -- Meine Hoffnung soll mich leiten Durch die Tage ohne Dich Und die Liebe soll mich tragen Wenn der Schmerz die Hoffnung bricht -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: Vá: Vá : awk FIELDWIDTHS howto?
On Wed, Jan 09, 2008 at 14:16:38 -0600, Sergio Cuéllar Valdés wrote: 2008/1/9, Paul Csanyi: So, if you only need package name: aptitude search ~i | cut -d -f3 It is cut, not awk. Howewer, it is not god. The output file contains empty lines besides of the package names. No blank lines : aptitude search ~i | cut -d -f3 | sed '/^$/d' done yes, no awk You can tell aptitude that you want a list of only the package names: aptitude -F%p search ~i -- Regards,| http://users.icfo.es/Florian.Kulzer Florian |
Re: Vá: awk FIELDWIDTHS howto?
On 9 Jan, Sergio Cuéllar Valdés wrote:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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:
$ 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
-Chris
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| Research Scientist III |
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Vá: awk FIELDWIDTHS howto?
2008/1/9, Daniel Mahoney [EMAIL PROTECTED]:
I think I'm missing something here. Why are you doing the FIELDWIDTHS
thing when you can just split on whitespace? Won't something like:
aptitude search ~i | awk '{print $2}'
give you what you want?
No.
The records for awk are like these lines, derived from
'aptitude search ~i' :
...
i cpio- GNU cpio -- a program to manage archives
i A cpp - The GNU C preprocessor (cpp)
i A cpp-4.1 - The GNU C preprocessor
...
So, (from the abowe example)
in the 1. record:
the 1. field is 'i', the 2. field is 'cpio', the 3. field is '-', etc.
in the 2. record:
the 1. field is 'i', the 2. field is 'A', the 3. field is 'cpp', etc.
in the 3. record:
the 1. field is 'i', the 2. field is 'A', the 3. field is 'cpp-4.1', etc.
So the command here:
aptitude search ~i | awk '{print $1 $2 $3 $4}' \
foltelepitett_debian_csomagok
give to me these:
i cpio - GNU
i A cpp -
i A cpp-4.1 -
and the command:
aptitude search ~i | awk '{print $2}' \
foltelepitett_debian_csomagok
give to me these:
cpio
A
A
So, why don't works FIELDWIDTHS as I would to expect?
If I give to awk { FIELDWIDTHS = 4 32} why give to me these:
cpio
A
A
with command:
aptitude search ~i | awk '{ FIELDWIDTHS = 4 32}\
{print $2}' foltelepitett_debian_csomagok
--
Regards, Paul Csanyi
http://www.freewebs.com/csanyi-pal/index.htm
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Vá: awk FIELDWIDTHS howto?
2008/1/9, [EMAIL PROTECTED] [EMAIL PROTECTED]:
On 9 Jan, Sergio Cuéllar Valdés wrote:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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
Vá: awk FIELDWIDTHS howto?
2008/1/9, Florian Kulzer [EMAIL PROTECTED]: You can tell aptitude that you want a list of only the package names: aptitude -F%p search ~i Thank you! I should read better the aptitude man pages! -- Regards, Paul Csanyi http://www.freewebs.com/csanyi-pal/index.htm -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: Vá : awk FIELDWIDTHS howto?
On Wed, Jan 09, 2008 at 08:48:38PM +0100, Paul Csanyi wrote:
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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.
aptitude search ~i | awk '{print $2}'
Maybe that's what you want? I've used awk a lot, never looked at
FIELDWIDTHS, and have proabably never set NF. I'm not sure what you're
trying to acheive, but good luck with it!
Ken
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?
something like this: aptitude search ~i | cut -d -f2
does this help you ?
No.
--
Regards, Paul Csanyi
http://www.freewebs.com/csanyi-pal/index.htm
--
Ken Irving, [EMAIL PROTECTED]
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Re: Vá : awk FIELDWIDTHS howto?
On Wed, Jan 09, 2008 at 08:48:38PM +0100, Paul Csanyi wrote:
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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 don't know aptitude, but that output can hardly constitute a
record, since busybox is the 2nd field whereas bzip2 is
the 3rd because of that A.
I try to get only the package name from the 2. field.
Which is what you've got: A is the second field.
FIELDWIDTHS = 4 32
I don't know awk, either (What the hell am I doing in this
thread ? :{) and I couldn't find FIELDWIDTH in the awk manpage,
but perhaps it doesn't do what you think it does. Perhaps it
just limits the length of a longer field for output.
The given width for 1. field (4) should be right, but isn't.
Awk give me the letter A as a 2. field. Why?
Because it is the second field, but since the lines returned
by that aptitude command are inconsistent in format I'm afraid
I can't think of anything you can do about it. If you know
what sort of things might appear where that A appears, you
could maybe insert something like
sed -r 's/ [A-Z] //g'
into your command.
something like this: aptitude search ~i | cut -d -f2
does this help you ?
No.
--
Regards, Paul Csanyi
http://www.freewebs.com/csanyi-pal/index.htm
--
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Re: Vá : awk FIELDWIDTHS howto?
On Wed, Jan 09, 2008 at 08:48:38PM +0100, Paul Csanyi wrote:
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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
This will give you what you want:
aptitude search ~i | awk '{ print substr($0,5,32) }'
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him--that is, anyone who stands between him and the real world. This is
what authority means: immunity from competence. -- Philip Slater
Rick Pasotto[EMAIL PROTECTED]http://www.niof.net
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Re: Vá: awk FIELDWIDTHS howto?
David Jardine wrote:
On Wed, Jan 09, 2008 at 08:48:38PM +0100, Paul Csanyi wrote:
2008/1/9, Sergio Cuéllar Valdés [EMAIL PROTECTED]:
2008/1/9, Paul Csanyi [EMAIL PROTECTED]:
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 don't know aptitude, but that output can hardly constitute a
record, since busybox is the 2nd field whereas bzip2 is
the 3rd because of that A.
I try to get only the package name from the 2. field.
Which is what you've got: A is the second field.
FIELDWIDTHS = 4 32
I don't know awk, either (What the hell am I doing in this
thread ? :{) and I couldn't find FIELDWIDTH in the awk manpage,
but perhaps it doesn't do what you think it does. Perhaps it
just limits the length of a longer field for output.
My man page says:
If the FIELDWIDTHS variable is set to a space separated list of
numbers, each field is expected to have fixed width, and gawk splits
up the record using the specified widths. The value of FS is ignored.
The given width for 1. field (4) should be right, but isn't.
Awk give me the letter A as a 2. field. Why?
Because it is the second field, but since the lines returned
by that aptitude command are inconsistent in format I'm afraid
I can't think of anything you can do about it. If you know
what sort of things might appear where that A appears, you
could maybe insert something like
sed -r 's/ [A-Z] //g'
into your command.
something like this: aptitude search ~i | cut -d -f2
does this help you ?
No.
--
Regards, Paul Csanyi
http://www.freewebs.com/csanyi-pal/index.htm
The bottom line problem is that the aptitude output has a fixed
formatting, but the columns it prints are variable. So, given the
fixed formatting, any command that honors that would work:
aptitude search ~i | cut -c5-32 # NOTE! used -c, not -d -f2
aptitude search ~i |
sed 's/^\(\).*$/\1/'
That sed command remembers character 5 through 32 and replaces the whole
line with the remembered stuff. I'm not a 'sed' programmer, though, so
I'm sure there's a simpler way to specify repetition, I just didn't
bother to look it up.
I don't know if the following observation is a bug or a feature, but you
apparently need to specify the number of field widths you want, *plus
one*. Also, use the BEGIN keyword on code that needs to be globally
available or done just once. The original code will reassign
FIELDWIDTHS for every line of output. This code works as desired:
aptitude search ~i | awk 'BEGIN{FIELDWIDTHS = 4 32 1};{print $2}'
--
Bob McGowan
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