[sf-lug] I need a quick piece of code..

[jim]

   oh, yeah: also, how can we structure for loops for 
these problems? 

for <VAR> in <LIST> <COMMANDS> 

for i in `seq 1 3 120` 
do 
head -$i <filename> | tail -1 | cut -d':' -f4 
done 



On Thu, 2009-12-31 at 10:08 -0800, jim wrote:
> +1 
> 
>    wrt problem definitions, maybe we can come up with 
> several common parameters and general cases via email 
> before the hoped-for python class that may or may not 
> happen at noisebridge from 6:30 PM to 8 PM this coming 
> monday (20100104)? (interested in a more-or-less 
> intro to python and/or programming in general? this 
> class has a flexible and accommodating format to let 
> people just jump right in no matter their level.) 
> 
> 
>    i like general parametric and problem definitions 
> that can be used as specs for a variety of languages, 
> (for my interests: shell scripts, c, and python) 
> e.g.: 
> 
> parametric specs: 
> * all files are ASCII text files (note that numbers, 
> therefore, are strings of text constrained to the 
> ten numerals and perhaps the six alpha chars 
> (a,b,c,d,e,f) for hex (and if so, uppercase and/or 
> lowercase). 
> * types of numbers: phone numbers, dates, money, 
> results of the four arithmetic operations, output 
> of commonly used gnu toolkit commands (e.g. wc).... 
> * common flatfile formats (e.g. /etc/passwd, which 
> uses both the colon (:) and the comma (,) 
> characters as field delimiters, the command line 
> (and shell scripts) which typically (tho' not 
> necessarily) use the space character as field 
> (parameter) delimiters.... 
> * a filter that can be used to parse the output 
> of commands (which commands: who, ps, wc...?), 
> probably should exercise the use of the cut 
> command if implemented as a shell script: what's 
> the python equivalent of the cut command? 
> * anything involving the use of the find command 
> (what's the python equivalent?). 
> 
> use case specs: 
> * /etc/passwd and /etc/group (maybe the fifth 
> field--the "comment" field--if it has 
> comma-delimited contact info?). 
> * shell scripts (parsing python or perl scripts 
> seems a bit beyond). 
> * various configuration files, the more regular 
> the better (e.g. dns zone files)  
> * simple flatfile use cases in which each "record" 
> is on a line by itself and for which fields are 
> delimited by some one character (and possibly 
> allowing a sub-field delimiter, again e.g. the 
> fifth field of the /etc/passwd file). this could 
> include custom files such as a list of friends 
> with contact info and birthdays, a ToDo list with 
> dates and chores. again, the more regular the 
> better. (i recall that larry wall developed perl 
> from the c programs and shell scripts he'd 
> created as his own toolkit to "parse" irregular 
> text files. 
> 
> (stop me, i can't help myself...) 
> 
> 
> 
> 
> On Thu, 2009-12-31 at 07:27 -0800, Alex Kleider wrote:
> > It would be good to have the problem defined.
> > So far the assumption has been that you want to return the last line of a file which you happen to know will be an integer- I'm doubting that that is the real problem.
> > Could it be the more general problem of returning all integers? ..integers on single lines by them selves?  .. what are the other possibilities????
> > This seems like the perfect little exercise for the python class held (over the holidays: somewhat irregularly) on Monday evenings.
> > 
> > ak
> > 
> > --- On Wed, 12/30/09, John F. Strazzarino <jstrazza at yahoo.com> wrote:
> > 
> > > From: John F. Strazzarino <jstrazza at yahoo.com>
> > > Subject: [sf-lug] I need a quick piece of code..
> > > To: "SFLUG Mailing List" <sf-lug at linuxmafia.com>
> > > Date: Wednesday, December 30, 2009, 10:25 PM
> > > I
> > > have a three line text file
> > >  
> > >  
> > > This is a test
> > > blank line
> > > 123456
> > >  
> > >  
> > > The last line of the file is a number and I need just
> > > that number....
> > >  
> > > I know that this must be a combo of tail and grep
> > > 
> > >  
> > > Can anyone help......nothing fancy is needed...
> > > \\
> > > Thanks
> > >  
> > > John
> > >  
> > > 
> > > 
> > >       
> > > -----Inline Attachment Follows-----
> > > 
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> > 
> >       
> > 
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> 
> 
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