here split command is reading the input from the output of myapp and it will write the text in to file where in each file size is 10MB and it will create upto 10 files.
I have observed split is flushing the data for every 4096 bytes. if my application suddenly crashes am not getting the latest messages in to the file.
Can i specify to split command to flush the data immediately once the input text is read?.
The problem is not split. Your app needs to block & process signals, SIGSEGV, for example. When the program is going to bomb it should call fsync or fdatasync on the output stream to split, then re-raise signal it orginally got and let it proceed unblocked.
The same is true for fatal errors the program itself enounters.
well..i know how to handle in signals. let me rewrite my statement.
let's say if the application safely exit if one condition met. Split command flushing data for every 4096 bytes. i want to see the logs when the application exits.
basically i used split command to put the restriction on the size of the out put files. i am calling split command in the infinite loop. this will be useful even if the max generation of the file limit reaches.
The only way split will flush output is to get an EOF on stdin.
To my knowledge there is no way to force sync on a child process, especially when it is a command line utility. You will have to roll your own version of split. Have it look for something in the input stream that forces it to fflush() the output stream.
fflush(stdin) is undefined behavior in standard C. (C89 && C99)
my objective is to put restriction on the size of the out put file.
for example
./myapp >> a.txt
let's say if my application runs for 1 year then the size of a.txt is huge in terms of billions.
I am looking for an approach to put the restriction on the size of the out put file. that's the reason i have gone for split. i wrote a wapper script over split command to run in infnate loop.
When i first seen your post itself, it was interesting to me. I started a small research, but unsuccessful in that because of other reasons. But now got a good understanding, here is it, hope it will be useful for you.
Hope you understand the below code, if not, this is the explanation:
A perl application which writes a number every one second, and also handles SIGINT, by flusing and closing stdout, and exiting.
I executed this program, like this:
As expected, it started writing both in STDERR and also in STDOUT, so after some seconds i had given SIGINT like,
So the following was the outcome,
Tested whether everything was given to split, and does split processed ?
Yes.
Program wrote only 8 characters, and all are handled by split ( and it does not wait for 4096 as you have mentioned ).
So the final thing, you have to handle the signal and flush the output.
Hope it helps.
Hi All,
I have a txt file which I would like to partition into 2 separate output files. I would like to partition the odd or even groups of 4 lines from the txt file. So I would like lines 1-4 to go to file1, and lines 5-8 to go to file2, and so on until the whole txt file is divided into two... (1 Reply)
Hi All,
I want to split the file after size gets above 100kb.
So I am using below command.
split -b 100kb File.txt Test
But after first file, my record is breaking as in middle of the record, size of file is getting above 100kb. So after splitting half record is in one file and half... (1 Reply)
Hi,
There is an awk command in script and it is running successfully.
I want to split that command in 2 lines.
I have tried using '\' but its not working..
Please suggest me the solution. (11 Replies)
Hi I have a sequence which looks like this
# PH01000000
PH01000000G0240 P.he_genemodel_v1.0 CDS 120721 121773 . - . ID=PH01000000G0240.CDS;Parent=PH01000000G0240
PH01000001G0190 P.he_genemodel_v1.0 mRA 136867 137309 . - . ID=PH01000001G0190.mRNA;Parent=PH01000001G0190... (7 Replies)
hi all,
i have problem with my script in unix ...i have script with split -d (--numeric-suffixes) in linux its working but in solaris machine the option -d isn't have
so how to i can change split -d (this output) will same in output solaris can i change with awk and how do that
thx before (2 Replies)
Is there an option or a way with the split command to rename the partitioned files with a counter. For example, can the files testaa, testab, testac be renamed to test1, test2, test3 from the split command without explicilty renaming files.
Thanks,
- CB (3 Replies)
Hi,
I have to split a line of the form
1232423#asdf#124324#54534#dcfg#wert#rrftt#4567
into an array in perl. I am using
@fields;
@fields=split('#',$line);
if($fields eq "1")
But this is not working. By using the syntax, the statements in "if" are never executed. Please help.... (9 Replies)
HI! All
iam using Split command to split a large .txt file in to smaller files,
The syntax iam using
split -25000 Product.txt
iam getting four output files but not in .txt format but in some other format ,
when i checked the properties the Type of the output files is Type
can any... (7 Replies)
I want to split a file containing millions of records.
I am issuing the command
split -l 20000 filename which will split the file in 20K records each.
It works fine except in some files, data after one particular field is lost( the field with space).
Say the record is ... (4 Replies)