logrotate does the same thing. Rats, shucks, and bummer dude. I was really hoping that this was going to work I guess I need to code the java app to write to a log file and I will have to figure out how to accept a signal to close and reopen the new file. I guess I should have known this was too easy. I really would like to know what is going on if anyone has any ideas. Is there something I am doing incorrectly? For what it is worth I am running 2.2.5-22smp kernels from redhat on a compaq3000 with two 200MHz pentium pros, 1GB RAM and a 5 drive raid 5 array. BTW this seems really slow to execute the script. about 13 seconds with or without the echos and redirecting output. Bret Bret Hughes wrote: > > Hmmm Same deal. Here is what I am doing. > > #testtime > numfile & > #trunclog numfile > > here are the scripts: > > [bhughes@compaq2 bhughes]$ less testtime > #! /bin/sh > echo 'setting num to 0' > i=1 > while [ $i -lt 2000 ] ; do > > echo $i > i=`expr $i + 1` > done > > [bhughes@compaq2 bhughes]$ less trunclog > #! /bin/sh > # trunclog > echo 'about to truncate' $1 > if [ -f $1 ] > then > cp $1 $1.bak > # cat /dev/null > $1 > echo >$1 > else > echo 'file not found' > fi > > output of ls after running both files > > [bhughes@compaq2 bhughes]$ ls -l > total 28 > -rw-rw-r-- 1 bhughes bhughes 8905 Jan 21 11:37 numfile > -rw-rw-r-- 1 bhughes bhughes 8425 Jan 21 11:37 numfile.bak > -rw-rw-r-- 1 bhughes bhughes 35 Jan 17 16:18 testfile > -rwx------ 1 bhughes bhughes 104 Jan 20 11:24 testtime > -rwx------ 1 bhughes bhughes 153 Jan 21 11:30 trunclog > > I run trunclog befor the background job is finished and after > truncation, numfile has a whole shitload of @ symbols on the same line > as the first number > > ls after removing all @s > > [bhughes@compaq2 bhughes]$ ls -l > total 32 > -rw-rw-r-- 1 bhughes bhughes 8905 Jan 21 11:37 numfile > -rw-rw-r-- 1 bhughes bhughes 8425 Jan 21 11:37 numfile.bak > -rw-rw-r-- 1 bhughes bhughes 480 Jan 21 11:41 numfile.clean > -rw-rw-r-- 1 bhughes bhughes 35 Jan 17 16:18 testfile > -rwx------ 1 bhughes bhughes 104 Jan 20 11:24 testtime > -rwx------ 1 bhughes bhughes 153 Jan 21 11:30 trunclog > > now that I look at it it looks like the file size is kept the same and > padded with these @ symbols. since the total of the clean file and the > bak file equals the size of new numfile. > > Yep, just ran testtime all the way though without truncating and the > size is indeed 8905. shell must be keeping track of where it is writing > on the disk and keeping going? I don't pretend to know enough about > what is happening but it is interesting. I'll dig into the logrotate > doc and see if I can fire off logrotate to truncate the file before it > is finished. > > Any ideas? > > Bret > > Tom Gilbert wrote: > > > > * Bret Hughes ([EMAIL PROTECTED]) wrote: > > > Good to know also. I tried the cat /dev/null > logfile technique and > > > while I did not loos any data there is about 4K or so of garbage at the > > > begining of the logfile. In less it shows up as all '@' (noquotes) > > > symbols. > > > > > > Does not look good for the cat dev/null > technique. I am going to use > > > the logrotate any way but was hoping to learn something. I guess I did, > > > just not what I was hoping :-) > > > > > > Thanks again > > > > > > Bret > > > > That shouldn't happen. Odd. Well, if that doesn't work, even simpler > > is: > > > > $ echo > logfile > > > > Tom. > > -- > > .-------------------------------------------------------. > > .^. | Tom Gilbert, England | [EMAIL PROTECTED] | > > /V\ |----------------------| www.tomgilbert.freeserve.co.uk | > > // \\ | Sites I recommend: `--------------------------------| > > /( )\ | www.freshmeat.net www.enlightenment.org slashdot.org | > > ^^-^^ `-------------------------------------------------------' > > > > -- > > To unsubscribe: mail [EMAIL PROTECTED] with "unsubscribe" > > as the Subject.
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