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The time now is Sat 18 May 2013, 13:05 All times are UTC - 4 |
 Forum index » Off-Topic Area » Programming |
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Getting line numbers and jump in to
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| Page 1 of 2 [16 Posts] | Goto page: 1, 2 Next |
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RSH
 Joined: 05 Sep 2011 Posts: 1564 Location: Germany |
Hi. Again my List:
In LazY MAID i do use the indexes to search for the files on the web. I want to use the already downloaded and on every run updated full list (might be faster?) to search for the files (using the indexes). So if i would use grep to check if index 59217 is in the file, it would be true. But how could i do this returning the line number as a result and then to jump into the text file to this line and read out the file from this jump-in-point? RSH _________________ Useful Software for Puppy! LazY Puppy - a Paradise Puppy! - DE & EN ISO 2.0.2-0.0.5 available |
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Flash
Official Dog Handler  Joined: 04 May 2005 Posts: 9840 Location: Arizona USA |
RSH, I read through your post several times and still don't understand what you're doing, so I'm afraid I can't help with your subject line. Are you continuing a discussion from another thread? If so, at least put in a link to the other thread. And you do know that you can edit your posts, including their subject lines? |
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SFR
 Joined: 26 Oct 2011 Posts: 570 |
Hmm, I too am not sure if I understood correctly... Assuming that index file looks like:
will return:
which is line_number:line_content To "jump-in" that line number and read contents I usually use simple:
Is that what you need? Greetings! _________________ [O]bdurate [R]ules [D]estroy [E]nthusiastic [R]ebels => [C]reative [H]umans [A]lways [O]pen [S]ource Omnia mea mecum porto. |
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seaside
Joined: 11 Apr 2007 Posts: 832 |
SFR, If you just want the corresponding filename belonging to the index line number, you might do this
$filename will then equal Htop.png Cheers, s |
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Karl Godt
 Joined: 20 Jun 2010 Posts: 2673 Location: Kiel,Germany |
cat -n and grep -n are the only possibilities to get the line number in files i know of too . PATTERN="59224"
would print something like this into console :
and cat -n :
prints like
with tabs . Somewhat more uncomfortable . Now sed can be used in these two forms for example :
or
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RSH
Joined: 05 Sep 2011 Posts: 1564 Location: Germany |
Hi to all. Thanks for the replies. I have to look deeper into that later. I had a go on what SFR did post, but couldn't get it finally to work. I did get the line number but could not read the file continually, starting at the line number. Maybe Karl's Code will do it, but that's a lot of confusing code to me - still. 
So i have to learn a bit more. RSH _________________ Useful Software for Puppy! LazY Puppy - a Paradise Puppy! - DE & EN ISO 2.0.2-0.0.5 available |
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Keef
 Joined: 20 Dec 2007 Posts: 428 Location: Staffordshire |
If I get it right and you want a list starting from a particular line number, will the above do? It is just a mash-up of Karl and seaside's suggestions. If I've completely got the wrong idea, I promise to stick to lurking... |
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RSH
Joined: 05 Sep 2011 Posts: 1564 Location: Germany |
Yes, Keef. This does the job exactly. Thanks. Just another issue ---> it reads the file until its end. I want to stop reading the file if returned PATTERN is equal or even bigger than a defined end-PATTERN: Let's say to read from 59100 to 59225. How to check if it is bigger than the end-PATTERN. In PASCAL i would write:
_________________ Useful Software for Puppy! LazY Puppy - a Paradise Puppy! - DE & EN ISO 2.0.2-0.0.5 available |
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Karl Godt
Joined: 20 Jun 2010 Posts: 2673 Location: Kiel,Germany |
let's say line_nr_begin=100 and line_nr_end=200 should print lines 100 til 200 of the index.txt file . But i think that you are still trying to loop .
from
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RSH
Joined: 05 Sep 2011 Posts: 1564 Location: Germany |
Thank you Karl. Yes, i did try to use a loop - but failed. Just hacked a little (trial and error) and then, suddenly: solved!  (i thought so) 
Used script:
Output ---> test.lst:
But now there is another problem. If i use index PATTERN=203 and ENDPATTERN=225 it finds 203, 1203, 2203, 3203 ... ... ... for the PATTERN and 225, 1225, 2225, 3225 ... ... ... for the ENDPATTERN and returns several line numbers, which makes the above used script useless. 
I need to find exactly and only 203 if this is the PATTERN and returning only the line_number of PATTERN (to start reading) and 225 if this is the ENDPATTERN and only the end_line_number of ENDPATTERN (to end reading). Used list attached ---> remove .gz
_________________ Useful Software for Puppy! LazY Puppy - a Paradise Puppy! - DE & EN ISO 2.0.2-0.0.5 available |
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RSH
Joined: 05 Sep 2011 Posts: 1564 Location: Germany |
This seems to work properly (as long as the index is existing). I just had to refine format of the indexes (adding 00 in front). 
Indexes now listed as 00215, 001215, 002215, 003215 etc.
To make sure 0032150 is not found for 003215 i add the - at the end of PATTERN and ENDPATTERN. Output:
Puuhhhh... _________________ Useful Software for Puppy! LazY Puppy - a Paradise Puppy! - DE & EN ISO 2.0.2-0.0.5 available |
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seaside
Joined: 11 Apr 2007 Posts: 832 |
RSH, Formatting numbers is handy using "fprint".
Creates six digits and pads with zeros in front. Cheers, s |
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Karl Godt
Joined: 20 Jun 2010 Posts: 2673 Location: Kiel,Germany |
grep -w $PATTERN is handy too . -w option uses WORD ie
[ grep -w 321 testfile.txt ] should only grep the first of the three above patterns . Also usefull are the special chars ' ^ ' for the beginning of a line and ' $ ' for the end ie
* Barry does not use grep -w (much) , he formats mostly before like
* And if you want to grep the extensions ie .pet it would be something like
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technosaurus
 Joined: 18 May 2008 Posts: 3843 |
if you are concerned about speed, Awk can basically replace: grep ... /string/ Print line # ... FNR cut ... By changing FS or using split sed/tr ... sub and gsub bash wc And many more To jump to a matching line it would resemble: (i say resemble because I am speculating from my phone ....untested) awk 'BEGIN{FS="-";}/STRING/{print FNR $2}' Though it would probably be unnecessary to have the numbers at all, the the FS would not need to change to - either Awk combines bash, cut, grep, sed and others into 1 tool with pretty print capabilities and floating point math. P.s. "-" is not the best separator, think how many files have it, compared to tabs its just an extra complication, easy enough to cope with if necessary though _________________ Puppy Web Desktop Now with pet packages - Pet Packaging 100 & 101 |
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Karl Godt
Joined: 20 Jun 2010 Posts: 2673 Location: Kiel,Germany |
Technosaurus, thanks for mentioning how to use the FNR special variable . Will have to test it . Does FNR means the same as '-f2-' for cut ( all variables ($3,$4,$5,...) ) ? . Because of not knowing how to use an 'all variables until the end' syntaxt i have not used awk much . |
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Getting line numbers and jump in to
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