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How To Rotate A File in HP-UX?

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Operating Systems HP-UX How To Rotate A File in HP-UX?
# 1  
Old 10-29-2013
How To Rotate A File in HP-UX?
I need to rotate a file in HP-UX of a application. Iīve tried to do a task in the cron with a script (with sed and ed commands) but it was a successfully option (the application continued writing the file Smilie )


Code:
LINEAS_OUT=$(wc -l < $RMISTDOUT)
 LINEAS_FIN=1,expr $LINEAS_OUT - 100p 

sed -n  "$LINEAS_FIN" $RMISTDOUT  > $BACKUP_RMISTDOUT  LINEAS_DELETE=1,expr $LINEAS_OUT - 100d 

N_DELETE=1,expr $LINEAS_OUT - 100p 

printf "$LINEAS_DELETE\nw" | ed -s $RMISTDOUT 

printf "$N_DELETE\nw" | ed -s $RMISTDOUT gzip $BACKUP_RMISTDOUT &



The second option that i tried, was splitting the file at the start of the program:


Code:
/usr/local/coreutils/bin/split -a7 -b 50m -u - {FILE}.${DATE}.stdout

but with this option, it seems like nothing is written into file out until the whole file has been finally processed (yeah, this is a problem).
I have read that a option is to use stdbuf like this:


Code:
~/coreutils/bin/stdbuf -o0 ~/coreutils/bin/split .....

but i donīt have it in my system (PA-RISC B.11.11)...
Any ideas? Thanks!
Last edited by Scrutinizer; 10-30-2013 at 06:34 AM.. Reason: code tags added
# 2  
Old 10-29-2013
Wrench
We use 'logrotate' on our systems. standard on the linux systems. Available for HP-UX at hpux .connect .org.uk. (would have posted link but forum wouldn't let me.
# 3  
Old 10-30-2013
Thanks nzle, but i have tried logrotate and it doesnīt work. The problem is that my aplplications is continuosly running the same file...logrotate does something like:

1.- mv <fileorigin> <filecopy>
2.- gzip <filecopy>
3.- create a new <fileorigin>

In the step 3, my application can not write yet in the <fileorigin>...Smilie

1.-
Code:
5127 Oct 30 09:52 RmiService.stdout

2.-
Code:
1610 Oct 30 09:52 RmiService.stdout-20131030.gz
   0 Oct 30 09:54 RmiService.stdout

3.- Application is running and try to write...
Code:
  0 Oct 30 09:54 RmiEcpService.stdout

Last edited by Scrutinizer; 10-30-2013 at 06:35 AM.. Reason: code tags added
# 4  
Old 10-30-2013
If you move the file, the writing will continue in the moved file...
I either stop the writing ( daemon ...) and restart or if cannot, do:
Code:
mv file.last file.beforelast
cp -p file  file.last
> file   # zero the file...
#gzip if you wish:

put in a script so it is executed flawlessly so I have less loss possible and choose a moment I know with minimum risk of activity to execute the code...
# 5  
Old 10-30-2013
Sorry vbe, but if i understand that you write, it does not work

Code:
 5127 Oct 30 11:42 RmiService.stdout
mv RmiService.stdout RmiService.stdout.bak
5127 Oct 30 11:42 RmiService.stdout.bak
cp -p RmiService.stdout.bak RmiService.stdout
5127 Oct 30 11:42 RmiService.stdout
5127 Oct 30 11:42 RmiService.stdout.bak
> RmiService.stdout
5127 Oct 30 11:42 RmiService.stdout.bak
0 Oct 30 11:44 RmiService.stdout

--- Apliccation writes in this moment
    0 Oct 30 11:44 RmiService.stdout
5485 Oct 30 11:44 RmiService.stdout.bak  --> Itīs using this...

or----

Code:
 5127 Oct 30 11:50 RmiService.stdout
cp -p RmiService.stdout.bak RmiService.stdout.bak2
5127 Oct 30 11:50 RmiService.stdout
5127 Oct 30 11:50 RmiService.stdout.bak
> RmiService.stdout
5127 Oct 30 11:50 RmiService.stdout.bak
  0 Oct 30 11:56 RmiService.stdout

--- Apliccation writes in this moment
 5127 Oct 30 11:50 RmiService.stdout.bak
5485 Oct 30 11:57 RmiService.stdout --> Itīs using this...

In the last code the problem is the size os the file...that will be 358 (5485-5127)...
# 6  
Old 10-30-2013
In my script you move the LAST backup that means if you have one..., NOT the active fille that is called "file" in my example the active file is the one you copy and nul after
# 7  
Old 10-30-2013
Yeah, i did that Smilie

Code:
  5127 Oct 30 13:38 RmiEcpService.stdout
cp -p RmiEcpService.stdout RmiEcpService.stdout.bak
>RmiEcpService.stdout
5127 Oct 30 13:38 RmiEcpService.stdout.bak
   0 Oct 30 13:38 RmiEcpService.stdout

-- Application writes in this moment
5127 Oct 30 13:38 RmiEcpService.stdout.bak
 5483 Oct 30 13:38 RmiEcpService.stdout

.....and the same before...the problem is the size os the file...that will be 358 (5485-5127)...
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