Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Can we use write() to modify/update intermediate records in a file
Top Forums Programming Can we use write() to modify/update intermediate records in a file Post 302132041 by maverix on Wednesday 15th of August 2007 02:26:43 AM
Old 08-15-2007
Hi porter,

Thank you for your inputs.

It was a simple mistake from my side.
I had copied the functions and forgot to change the parameter in the open system call from O_RDONLY to O_RDWR.

Upon seeing your reply, I realised my mistake.

Thanks for your reply.

Regards
maverix
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Count No of Records in File without counting Header and Trailer Records

I have a flat file and need to count no of records in the file less the header and the trailer record. I would appreciate any and all asistance Thanks Hadi Lalani (2 Replies)
Discussion started by: guiguy
2 Replies

2. Shell Programming and Scripting

Help needed in removing intermediate segments from a pipe delimited segment file

Hi, I just stuckup in doing some regular expressions on a file. I have data which has multiple FHS and BTS segments like: FHS|12121|LOCAL|2323 MSH|10101|POTAMAS|2323 PID|121221|THOMAS|DAVID|23432 OBX|2342|H1211|3232 BTS|0000|MERSTO|LIABLE FHS|12121|LOCAL|2323 MSH|10101|POTAMAS|2323... (3 Replies)
Discussion started by: naren_0101bits
3 Replies

3. UNIX for Advanced & Expert Users

unix script for update or insert records from a file to a oracle table

Hi, I have delimited file(|). Sample data: 1|name|50009|DS24|0|12 2|name|30009|DS24|0|13 3|name|20409|DS24|0|14 4|name|20009|DS24|0|15 5|name|10009|DS24|0|16 I want to load this data into a oracle table (update and insert) Please help me the commands and also... (1 Reply)
Discussion started by: unihp1
1 Replies

4. UNIX for Dummies Questions & Answers

update records in a file using shell script...

Hi, I have a file with 6 columns. First 3 columns together make unique record. I have a variable ($v) which hold a value that is obtained by a caliculaion. I have to replace value in 5th columnn with the value of the variable ($v). The value $v is caliculated from col4 and col6 values. ... (2 Replies)
Discussion started by: new_learner
2 Replies

5. Shell Programming and Scripting

insert a header in a huge data file without using an intermediate file

I have a file with data extracted, and need to insert a header with a constant string, say: H|PayerDataExtract if i use sed, i have to redirect the output to a seperate file like sed ' sed commands' ExtractDataFile.dat > ExtractDataFileWithHeader.dat the same is true for awk and... (10 Replies)
Discussion started by: deepaktanna
10 Replies

6. Shell Programming and Scripting

Push records to array during implicit loop and write to file

NEWBIE ALERT! Hi, I'm 1 month into learning Perl and done reading "Minimal Perl" by Tim Maher (which I enjoyed enoumously). I'm not a programmer by profession but want to use Perl to automate various tasks at my job. I have a problem (obviously) and are looking for your much appreciated help.... (0 Replies)
Discussion started by: jospan
0 Replies

7. Linux

Suggest update of two commands - who to write to?

I think it's about time the df and du commands (executables?) were updated to display gigabyte units without one having to do their own calculations from the -m option (display in megabytes). This is one of those "little nothing" annoyances that, at the same time, would positively show new... (3 Replies)
Discussion started by: SilversleevesX
3 Replies

8. UNIX for Dummies Questions & Answers

Grep specific records from a file of records that are separated by an empty line

Hi everyone. I am a newbie to Linux stuff. I have this kind of problem which couldn't solve alone. I have a text file with records separated by empty lines like this: ID: 20 Name: X Age: 19 ID: 21 Name: Z ID: 22 Email: xxx@yahoo.com Name: Y Age: 19 I want to grep records that... (4 Replies)
Discussion started by: Atrisa
4 Replies

9. Shell Programming and Scripting

Deleting duplicate records from file 1 if records from file 2 match

I have 2 files "File 1" is delimited by ";" and "File 2" is delimited by "|". File 1 below (3 record shown): Doc1;03/01/2012;New York;6 Main Street;Mr. Smith 1;Mr. Jones Doc2;03/01/2012;Syracuse;876 Broadway;John Davis;Barbara Lull Doc3;03/01/2012;Buffalo;779 Old Windy Road;Charles... (2 Replies)
Discussion started by: vestport
2 Replies

10. Shell Programming and Scripting

Remove duplicated records and update last line record counts

Hi Gurus, I need to remove duplicate line in file and update TRAILER (last line) record count. the file is comma delimited, field 2 is key to identify duplicated record. I can use below command to remove duplicated. but don't know how to replace last line 2nd field to new count. awk -F","... (11 Replies)
Discussion started by: green_k
11 Replies

LEARN ABOUT DEBIAN

tchtest

TCHTEST(1)							   Tokyo Cabinet							TCHTEST(1)

NAME

       tchtest - test cases of the hash database API

DESCRIPTION

       To use the hash database API easily, the commands `tchtest', `tchmttest', and `tchmgr' are provided.

       The command `tchtest' is a utility for facility test and performance test.  This command is used in the following format.  `path' specifies
       the path of a database file.  `rnum' specifies the number of iterations.  `bnum' specifies the number of  buckets.   `apow'  specifies  the
       power of the alignment.	`fpow' specifies the power of the free block pool.

	      tchtest write [-mt] [-tl] [-td|-tb|-tt|-tx] [-rc num] [-xm num] [-df num] [-nl|-nb] [-as] [-rnd] path rnum [bnum [apow [fpow]]]
		     Store records with keys of 8 bytes.  They change as `00000001', `00000002'...
	      tchtest read [-mt] [-rc num] [-xm num] [-df num] [-nl|-nb] [-wb] [-rnd] path
		     Retrieve all records of the database above.
	      tchtest remove [-mt] [-rc num] [-xm num] [-df num] [-nl|-nb] [-rnd] path
		     Remove all records of the database above.
	      tchtest  rcat  [-mt]  [-tl]  [-td|-tb|-tt|-tx] [-rc num] [-xm num] [-df num] [-nl|-nb] [-pn num] [-dai|-dad|-rl|-ru] path rnum [bnum
	      [apow [fpow]]]
		     Store records with partway duplicated keys using concatenate mode.
	      tchtest misc [-mt] [-tl] [-td|-tb|-tt|-tx] [-nl|-nb] path rnum
		     Perform miscellaneous test of various operations.
	      tchtest wicked [-mt] [-tl] [-td|-tb|-tt|-tx] [-nl|-nb] path rnum
		     Perform updating operations selected at random.

       Options feature the following.

	      -mt : call the function `tchdbsetmutex'.
	      -tl : enable the option `HDBTLARGE'.
	      -td : enable the option `HDBTDEFLATE'.
	      -tb : enable the option `HDBTBZIP'.
	      -tt : enable the option `HDBTTCBS'.
	      -tx : enable the option `HDBTEXCODEC'.
	      -rc num : specify the number of cached records.
	      -xm num : specify the size of the extra mapped memory.
	      -df num : specify the unit step number of auto defragmentation.
	      -nl : enable the option `HDBNOLCK'.
	      -nb : enable the option `HDBLCKNB'.
	      -as : use the function `tchdbputasync' instead of `tchdbput'.
	      -rnd : select keys at random.
	      -wb : use the function `tchdbget3' instead of `tchdbget'.
	      -pn num : specify the number of patterns.
	      -dai : use the function `tchdbaddint' instead of `tchdbputcat'.
	      -dad : use the function `tchdbadddouble' instead of `tchdbputcat'.
	      -rl : set the length of values at random.
	      -ru : select update operations at random.

       This command returns 0 on success, another on failure.

SEE ALSO

       tchmttest(1), tchmgr(1), tchdb(3), tokyocabinet(3)

Man Page							    2011-02-12								TCHTEST(1)
All times are GMT -4. The time now is 05:21 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy