Messages in this thread | | | Date | Sat, 27 Jan 2007 06:38:36 +0000 | Subject | scripts/makelst: bc -> shell Re: sed _s_gnu_alternatives_ (Re: [rft] (g)awk substitution) | From | Oleg Verych <> |
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Hallo.
On Sat, Jan 27, 2007 at 01:18:30AM +0100, Tim Schmielau wrote: > On Fri, 26 Jan 2007, Oleg Verych wrote: > > > In Debian's version it has no `bc', while native `bc' is producing > > crap like that: > > ,-*- bash -*- > > |olecom@flower:~$ printf "%u" $(( -1 )) ; echo > > |18446744073709551615 > > |olecom@flower:~$ echo -1 | bc > > |-1 > > |olecom@flower:~$ printf "%u" $(( 0xFF )) ; echo > > |255 > > |olecom@flower:~$ echo FF | bc > > |99 > > |olecom@flower:~$ echo F | bc > > |15 > > |olecom@flower:~$ > > `-*- > > > > i can't understand the result... I think linux/scripts/makelst may be > > updated to have sh's version of address calculation ;) > > No, IMHO that should not be a reason to change anything in the kernel. > Just set ibase=16 or read the fine manual:
Thank you very much ;) Maybe i must use XSLT with 0.99 kernel, or what?
I'm talking about patch posted here: Message-ID: <E1H9rZ3-0002T5-Po@flower> Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/485999>
,-*- diff snip -*- |- t4=`echo $t3 | gawk '{ print $1 }'` |- t5=`echo $t1 | gawk '{ print $1 }'` |+ t4=`pos_param 1 $t3` |+ t5=`pos_param 1 $t1` 5 t6=`echo $t4 - $t5 | tr a-f A-F` 6 t7=`( echo ibase=16 ; echo $t6 ) | bc` `-*-
I've just noticed, that things on lines 5 and 6 may be optimized.
t7=`printf "%lu" $(( 0x$t4 - 0x$t5 ))`
No tr, no bc, no pipes -- magic! Better know and use our *fine shell*.
And if you jouined us, Tim, maybe can share your experience and test patch above and this one, please? Message-ID: <E1H9qr4-0002Nu-RL@flower> Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/485984>
It's just my optimization hint. I have no bc, and i'm sure things, like that will cause silent misinformation.
Anyway, what is so bad in `sh'?
Thanks.
-*- OT -*- > info '(bc)About Expressions and Special Variables' GFDL. Enough of that bull, even Documentation/ is *free* from it.
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