Re^3: Offset Reading

Now the structure of the big file has been changed by the vendor and there is extraneous data in between each record for which I have to make use of the offset information each time before I can get the record I am interested in.... I wish I had more time to dedicate to the discovery of Perl abilities

That change appears to have happened 20 months ago. How have you been handling the problem in the interim?

Have you heard of seek?

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

RIP Neil Armstrong

Comment on Re^3: Offset Reading - two files

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Re^4: Offset Reading - two files by gio001 (Acolyte) on Dec 14, 2012 at 15:04 UTC
Hello, I have tried this, with no success: `perl -sple"BEGIN{open BIG};($1,$2)=split;seek(BIG,$1,$2);read(BIG,$_,$2)" -- -BIG=bigfile.dat index.dat >outfile.dat` What I asked '20 months' ago was not related to the change that occurred recently. Thanks	[reply] [d/l]
Re^5: Offset Reading - two files by BrowserUk (Patriarch) on Dec 14, 2012 at 15:10 UTC
seek does not take a length (`$2` as its third parameter. If you changed that to: `perl -sple"BEGIN{open BIG};($1,$2)=split;seek(BIG,$1,$2);read(BIG,$_,0 +)" -- -BIG=bigfile.dat index.dat >outfile.dat` [download] It might work. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice. RIP Neil Armstrong Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.	[reply] [d/l] [select]
Re^6: Offset Reading - two files by gio001 (Acolyte) on Dec 14, 2012 at 15:46 UTC
I have tried: `perl -sple 'BEGIN{open BIG};($1,$2)=split;seek(BIG,$1,0);read(BIG,$_,$2)' -- -BIG=bigfile.dat index.dat >outfile.dat` and I received the following: `Modification of a read-only value attempted at -e line 1, <> line 1` Thanks,	[reply] [d/l] [select]
Re^7: Offset Reading - two files by BrowserUk (Patriarch) on Dec 14, 2012 at 16:04 UTC
Re^8: Offset Reading - two files by gio001 (Acolyte) on Dec 14, 2012 at 16:14 UTC
Some notes below your chosen depth have not been shown here
Re^8: Offset Reading - two files by gio001 (Acolyte) on Dec 14, 2012 at 17:22 UTC
Re^7: Offset Reading - two files by johngg (Canon) on Dec 14, 2012 at 16:11 UTC
Re^7: Offset Reading - two files by Anonymous Monk on Dec 14, 2012 at 16:04 UTC
Re^4: Offset Reading - two files by gio001 (Acolyte) on Dec 14, 2012 at 15:06 UTC
Hello, I know I should not be wasting your time, sorry. Goodbye	[reply]