Using file partially for filenames

There are some commands that take file name and there are some case where you need to give file name. But there are some cases where you want to modify the file before passing it to the command. What do you do in these case’s?

I had a file containing huge amount of data and for some testing I wanted to pass only the first few lines of the file and not the complete file.  And since the file only accepted filename and would not take any input from the STDIN so only option was to create a file with the required data in a temporary file. So, I sat back to figure out some way to do it and finally found I can use this:

Tora installation on Fedora 16 with rpm

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Last article I talked about tora installation from the sources, but if that is too much for you then you can use this one liner:

rpm -ivh "http://amit-agarwal.co.in/mystuff/tora-2.1.3-1.fc16.i686.rpm"

But if you like the hard way out, then you can always try this.

Related articles

• Unrar in Fedora… (gryphon143.wordpress.com)
• Fedora Utils just got easier (funsurf.wordpress.com)
• rpmorphan – deborphan for the rpm based distros. (amit-agarwal.co.in)

tora on Fedora 16 for mysql and Oracle.

Sometime back I had posted a article on Tora on Fedora. But that was a while back and things have progressed and we already have Fedora 16 (aka Verne).

So, awhile back I installed Tora on my Fedora 16 and here are the steps to do so:

First get the Tora sources from sourceforge.net . Download the source tar file and extract the same.

Set gnome-shell to start in fallback mode without GUI.

If you run into issues with gnome-shell then gnome-shell should allow you to disable all the plugins and get the gnome-shell. But since gnome-shell is still evolving, you might run into issue where the shell does not come up. What to do in that case. You can set the shell to start in fallback mode, where there are more chances that it will come up.

Alas, but you don’t have a shell or desktop session to do that. Simple, start the gnome-shell and before it is killed, do this:

Color disk usage on Fedora

For this tip, you would need to setup the rpm-shere repository. You can get the information here. Once you have done that you need to install the cdu package with the following command:

sudo yum install cdu

And then you can use “cdu” to view the disk usage in all beautiful colors with the command:

cdu

and the output looks like this:

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Related articles

• Quickly install most of the things that you need on Fedora. (amit-agarwal.co.in)
• Upgrading Fedora using yum – FedoraProject (fedoraproject.org)
• Consistent ethernet device names in Verne (amit-agarwal.co.in)

Interesting repository for Fedora.

Here is one repository that you can add to your Fedora to give it a few more hundred packages:

cat >/etc/yum.repos.d/rpm-sphere.repo <<EOF
[rpm-sphere]
name=RPM Sphere
baseurl=http://download.opensuse.org/repositories/home:/zhonghuaren/Fedora_16/
gpgkey=http://download.opensuse.org/repositories/home:/zhonghuaren/Fedora_16/repodata/repomd.xml.key
enabled=1
gpgcheck=1
EOF

Benchmarking the system/CPU performance

Have you ever wanted to have a quick check on your CPU performance. I know that lot of people will say that this is not the right way to do this, but here is something that you can use to check the CPU speed.

#!/bin/bash -
#===============================================================================
#
#          FILE:  benchmark.sh
#
#         USAGE:  ./benchmark.sh
#
#   DESCRIPTION:  Benchmark the CPU
#
#       OPTIONS:  ---
#  REQUIREMENTS:  ---
#          BUGS:  ---
#         NOTES:  ---
#        AUTHOR: Amit Agarwal (aka), amit.agarwal@roamware.com
#       COMPANY: Roamware India Pvt Ltd
#       CREATED: 09/21/2011 11:46:03 AM IST
# Last modified: Wed Sep 21, 2011  12:22PM
#      REVISION:  ---
#===============================================================================

add ()
{
    COUNTER=0
    exec 2>&1
    time=$(exec 2>&1;(time while [[  $COUNTER -lt 100000 ]]; do ((COUNTER++)) \
        ; done))
    echo "Time for 100000 additions is "$time
}	# ----------  end of function add  ----------
mul ()
{
    COUNTER=0
    test=2
    exec 2>&1
    time=$(exec 2>&1;(time while [[  $COUNTER -lt 100000 ]]; do ((COUNTER++)) \
        ; ((test=test*2));done))
    echo "Time for 100000 mul is "$time
}	# ----------  end of function add  ----------
div ()
{
    COUNTER=0
    test=1000000000000
    exec 2>&1
    time=$(exec 2>&1;(time while [[  $COUNTER -lt 100000 ]]; do ((COUNTER++)) \
        ; (( test=test/2)); done)|tr -d '\n')
    echo "Time for 100000 divisions is "${time}
}	# ----------  end of function add  ----------

time add
time mul
time div

And here is the output :