get systemd journal entries on web interface.

Just in case you need it, you can get the journalctl entries from systemd in the web page.

First install :

yum install systemd-journal-gateway

Once you have done this you can get the journal entries with wget as well with

wget http://localhost:19531/entries

or if you prefer, you can browse with a browser at http://localhost:19531/. It has a nice little interface for browsing the entries, nothing too fancy but just sufficient.

sxiv – image viewer

sxiv is a nice alternative to feh. It is very light weight and quite useful. Here is the description:

Description :
sxiv is an alternative to feh and qiv. Its only dependency besides xlib
is imlib2. The primary goal for writing sxiv is to create an image viewer,
which only has the most basic features required for fast image viewing (the
ones I want). It works nicely with tiling window managers and its code base
should be kept small and clean to make it easy for you to dig into it and
customize it for your needs.

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Monitor your system with sysusage.

First some information on sysusage:

Description :
SysUsage continuously monitor your systems informations and generate
periodical graph reports using rrdtool or javascript jqplot library.
All reports are shown throught a web interface.

SysUsage grabs all system activities using Sar and system commands allowing
you to keep tracks of your computer or server activity during his life.
It is a great help for performance analysis and resources management. The
threshold notification can alarm you when the system capabilities are
reached by sending SMTP messages or throught Nagios reports.

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Apache server stats with small and useful bash script.

Just copy this script to your web-server cgi-bin directory and enjoy.

The script with show the common errors like 404 Error, Internal Server Error and others. It will show the User agent distribution using simple commands like grep, uniq, awk and so on.

You would need to change the tfile – which is temporary file and also the access.log path in the next line.

Just re-direct the output to some file with html extenstion. You could even put this in the cron which re-directs the output to some html in server document root.

bash – using the vi mode more effectively.

You can first set the bash mode to vi. This will enable some vim like features to bash. So, add this to .bashrc :

set -o vi

Once, you have done that then its time to get more out of the vi mode. First, check some things and set some interesting stuff.

zswap – compcache, compressed swap for better performance

First, here is a link to article on compcache.

http://code.google.com/p/compcache/wiki/CompilingAndUsingNew

zswap is already in the kernel and you can see the documentation in the kernel documentation. Here is the name of the file if you need:

/usr/share/doc/kernel-doc-$(uname -r)/Documentation/vm/zswap.txt

Here is the overview, in case you do not want to install kernel-doc

Overview:

Zswap is a lightweight compressed cache for swap pages. It takes pages that are
in the process of being swapped out and attempts to compress them into a
dynamically allocated RAM-based memory pool.  zswap basically trades CPU cycles
for potentially reduced swap I/O.  This trade-off can also result in a
significant performance improvement if reads from the compressed cache are
faster than reads from a swap device.

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cvs add files recursively – not already in repository

When you have a lot of files in some repository and you have added a couple of new, in CVS there is no command to add just the new ones to the repository, so here is a workaround for that.

cvs status 2>/dev/null | awk '{if ($1=="?")print "cvs add -kb " $2}'

Well, if you are adding text files then you might want to remove the “-kB” in the cvs command above.