Question

exec redirect keeps file pointer

Asked by: NickUpson

I have a script that includes

exec 1>> /var/log/unb/dblog.log

later logrotate renames the file to ...dblog.log.1 as expected but the script continues writing to the same file so the dblog.log.1 just gets bigger rather than starting to write to a new dblog.log as I expected. how can I get my expected behaviour

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Asked On
2007-08-08 at 02:14:13ID22748742
Tags

exec

,

redirect

,

file

Topics

Operating Systems Development

,

Linux Programming

,

Shell Scripting

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: TintinPosted on 2007-08-08 at 03:09:01ID: 19652723

In your script put

trap 'exec $0' 1

To restart it if it gets a SIGHUP make sure you have a

pkill -HUP yourscript

in the appropriate file in /etc/logrotate.d

 

by: ravenplPosted on 2007-08-08 at 04:15:57ID: 19653017

If the script takes no parameters, then it's otherwise

function huphandler { exec 1>>/var/log/unb/dblog.log; }
trap huphandler SIGHUP
#and initialize log
huphan;

rest of script

 

by: NickUpsonPosted on 2007-08-08 at 04:58:54ID: 19653213

The script runs in a loop with a sleep

do( 0 = 0 )
 <stuff>
 sleep 90
done

could I just cause the "exec 1>>/var/log/unb/dblog.log" to be reexecuted every time round the loop to get the same effect

 

by: ravenplPosted on 2007-08-08 at 05:09:00ID: 19653269

Yes. before <stuff> i guess.

20120131-EE-VQP-002

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