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Clearcase Tips Number 03 – managing label conventions with perl

I previously showed you how to use a shell script with Rational Clearcase, to alert you when a new branch type was created.

In this post, I will show you how to use a Perl script to enforce Clearcase labeling conventions. Perl LogoThis example is directed toward Clearcase on UNIX (i.e. Solaris or similar) and assumes you have Perl installed, working and have a basic knowledge of how to program in Perl. It is a reworked version of the windows script supplied by IBM on Developerworks.

This is a long post, but a good one if you are a new clearcase admin who needs to enforce label names.

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Understanding the effect of MQ persistence on disk performance

Do you use MQ? do you have performance problems when using persistence? An interesting article on understanding this on a Solaris platform. Koops has always been an informative source on getting my MQ performance under check, and again he comes to the front of the pack on analysis of performance issues.

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Solaris tar and changing absolute paths

On linux and other Unix like operating systems, you can untar a tar file with an absolute path to a different location. On Solaris using tar you can not. How do you get around this? Perderabo on the Unix for Advanced and Expert Users forum describes how. Here is an example (names and servers changed to protect the innocent):

you@yourserver:~ $ tar tvf data_backup.tar
-rwxrwx--- 13406/1201 2881056 Apr 26 19:29 2007 /apps/server/data/file
-rwxrwx--- 13406/1201 485376 Apr 26 19:29 2007 /apps/server/data/file.idx
you@yourserver:~ $ pax -r -s '=^/apps/server=/home/you=' < data_backup.tar you@yourserver:~ $ ls -l /home/you/data/ total 6624 -rwxr-x--- 1 d292462 strata 2881056 Apr 26 19:29 file -rwxr-x--- 1 d292462 strata 485376 Apr 26 19:29 file.idx

The key is the string given to pax '=^/apps/server=/home/you='. The /apps/server is the path you are replacing and the /home/you is the new path you are forcing tar to untar to. Mix and match as required. But the first string (/apps/server) is the part of the absolute path of each tarred file.

Now get to it.

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