Date: Tue, 06 Oct 2015 00:13:55 -0400 From: Jim Trigg <jtrigg@huiekin.org> To: Polytropon <freebsd@edvax.de> Cc: freebsd-questions@freebsd.org Subject: Re: awk question Message-ID: <EBFF44B4-EF90-4C39-B06D-54FF20FBB019@huiekin.org> In-Reply-To: <20151005235812.eee38247.freebsd@edvax.de> References: <5611C922.4050007@hiwaay.net> <20151005042129.1f153ec6.freebsd@edvax.de> <5611F776.9090701@hiwaay.net> <56124479.9020505@sneakertech.com> <20151005165902.ad01c288.freebsd@edvax.de> <5612EF57.10207@sneakertech.com> <20151005235812.eee38247.freebsd@edvax.de>
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Frighteningly enough, the syntax "< file command" does work...
Jim
On October 5, 2015 5:58:12 PM EDT, Polytropon <freebsd@edvax.de> wrote:
>On Mon, 05 Oct 2015 17:44:55 -0400, Quartz wrote:
>>
>> > The form "input | step1 | step2 | step3 | step4> result" usually
>> > is more readable
>>
>> That's what I meant my being easier to understand conceptually. I
>agree
>> about being more readable- even though this format sometimes needs
>the
>> 'useless cat' it's often my preferred coding style, especially in
>> scripts where the input might change around.
>
>And the "useless cat" method also makes it easy to test the
>script with varying input (for example, pre-generated test
>input) before it "goes live". It also makes it easier to
>"extend" the pre- or post-processing commands with new ones.
>
>
>
>> > Additionally, awk isn't that hard to learn. Reading "man awk" will
>> > provide you with a good background. And if you're already a C
>> > programmer, you'll see that many things you can do in C will also
>> > work similarly in awk, which _might_ not even be a good thing. :-)
>>
>> The problem with awk is the whole BEGIN/END/braces thing and how
>commas
>> interact with the operands.
>
>It's not that hard:
>
>BEGIN { ... } will be executed _before_ any input is processed,
>END { ... } will be executed _after_ all input has been processed.
>/pattern/ { ... } will be executed for each matching input line,
>(condition) { ... } will be executed when the condition is true,
>and { ... } will be executed for _every_ input line.
>
>Regarding commas: You can use the "print a b c" form as well as
>the more sophisticated C-like printf("format string", a, b, c)
>form. For all other functions, commas are argument separators
>just like in many other programming languages.
>
> % echo "a b c" | awk '{ print $3 $1 $2 }'
> cab
> % echo "a b c" | awk '{ print $3, $1, $2 }'
> c a b
> % echo "a b c" | awk '{ printf("%s-%s-%s\n", $3, $1, $2); }'
> c-a-b
>
>Those are the three "main methods" of printing: concatenated,
>separated by a space, and custom formatted string. And the
>semicolon is optional, it's just my C-contamination. :-)
>
>
>> It's not very much like sh or C syntax (or
>> any other syntax) and new users tend to get really confused.
>
>Hmmm... I don't know, could you provide an example where you
>would say, like, "this is not intuitive" or even "this does
>something totally strange"?
>
>
>
>> Also, different versions of awk handle math (esp floating point) with
>
>> different rounding/precision/overflow, making calculations vary
>between
>> installations, only further adding to the confusion.
>
>Yes, this is true, but keep in mind what awk is: a "pattern-directed
>scanning and processing language". If you want higher precision
>math, use system("<math stuff> | dc") and incorporate the result;
>awk isn't really for math, but integer math is usually fine. :-)
>
>
>
>--
>Polytropon
>Magdeburg, Germany
>Happy FreeBSD user since 4.0
>Andra moi ennepe, Mousa, ...
>_______________________________________________
>freebsd-questions@freebsd.org mailing list
>https://lists.freebsd.org/mailman/listinfo/freebsd-questions
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>"freebsd-questions-unsubscribe@freebsd.org"
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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From: Alexandre <axelbsd@ymail.com>
To: Nino J <nino80@gmail.com>
CC: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject: RE: SSHguard & IPFW
Date: Tue, 6 Oct 2015 09:59:43 +0200
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________________________________=0A=
> From: nino80@gmail.com =0A=
> Date: Wed=2C 30 Sep 2015 09:41:55 +0200 =0A=
> Subject: Re: SSHguard & IPFW =0A=
> To: axelbsd@ymail.com =0A=
> CC: freebsd-questions@freebsd.org =0A=
> =0A=
> On Tue=2C Sep 29=2C 2015 at 4:24 PM=2C Alexandre =0A=
> <axelbsd@ymail.com<mailto:axelbsd@ymail.com>> wrote: =0A=
> =0A=
> >> About the blocking rules reservation in IPFW (from rule 55000 to =0A=
> >> 55050)=2C anyone experienced yet full use of these rules? =0A=
> >> By default=2C fifteen addresses can be blocked together. But how SSHGU=
ARD =0A=
> >> works in this case for the newest one (51th)? =0A=
> >> =0A=
> >> Thank you in advance for your clarifications. =0A=
> >> Alexandre =0A=
> =0A=
> To answer your second question=2C IPFW has no problem using the same rule=
=0A=
> number for multiple rules. Thus sshguard is not limited to 50 =0A=
> addresses. =0A=
> =0A=
> Also=2C next version of sshguard won't use IPFW rules=2C but rather an IP=
FW =0A=
> table to insert IP addresses to be blocked. Thus it will only need a =0A=
> single deny rule. =0A=
> =0A=
> I'm currently using development version of sshguard which uses IPFW =0A=
> table and it works fine for me. =0A=
> =0A=
> Regards=2C =0A=
> -- =0A=
> Nino =0A=
> =0A=
=0A=
Hi Nino=2C=0A=
=0A=
I encounter now an issue with IPFW and blacklist functionnality: when I res=
tart sshguard service (or reboot the machine)=2C I need to delete /var/db/s=
shguard/blacklist.db before launch sshguard service again.=0A=
It is a know issue as described here http://sourceforge.net/p/sshguard/mail=
man/message/34146342/=0A=
Do you know when the next security/sshguard-ipfw version will be in FreeBSD=
ports?=0A=
=0A=
Thank you.=0A=
=0A=
Regards.=0A=
Alexandre=0A=
=0A=
=
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