12-09-2003
Append (cat) to beginning of file ?
Hi,
Fairly new to unix scripting, hoping to get some help.
using AIX v5
Basically I have 3 files 1). Header record 2). many detail record 3). Trailer record
My desired result is 1 file which contains Heaeder, Detail, Trailer
Currenty I am using a series of:
cat detail >> header
rm detail
cat trailer >> header
rm trailer
mv header detail
Now the problem with this approach is that my detail file quite often is in excess of 5gb, so the time is takes to do the cat seems like a waste of time to me. I would really like to be able to concatenate the header to the beginning of the detail and only "move" the one record.
Any ideas would be appreciated.
Thanks,
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VLLOG(5) AFS File Reference VLLOG(5)
NAME
VLLog - Traces Volume Location Server operations
DESCRIPTION
The VLLog file records a trace of Volume Location (VL) Server (vlserver process) operations on the local machine and describes any error
conditions it encounters.
If the VLLog file does not already exist in the /var/log/openafs directory when the VL Server starts, the server process creates it and
writes initial start-up messages to it. If there is an existing file, the VL Server renames it to VLLog.old, overwriting the existing
VLLog.old file if it exists.
The file is in ASCII format. Administrators listed in the /etc/openafs/server/UserList file can use the bos getlog command to display its
contents. Alternatively, log onto the server machine and use a text editor or a file display command such as the UNIX cat command. By
default, the mode bits on the VLLog file grant the required "r" (read) permission to all users.
The VL Server records operations only as it completes them, and cannot recover from failures by reviewing the file. The log contents are
useful for administrative evaluation of process failures and other problems.
The VL Server can record messages at three levels of detail. By default, it records only very rudimentary messages. To increase logging to
the first level of detail, issue the following command while logged onto the database server machine as the local superuser "root".
# kill -TSTP <vlserver_pid>
where <vlserver_pid> is the process ID of the vlserver process, as reported in the output from the standard UNIX ps command. To increase to
the second and third levels of detail, repeat the command.
To disable logging, issue the following command.
# kill -HUP <vlserver_pid>
To decrease the level of logging, first completely disable it and then issue the "kill -TSTP" command as many times as necessary to reach
the desired level.
SEE ALSO
UserList(5), bos_getlog(8), vlserver(8)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas
Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2012-03-26 VLLOG(5)