Category Archives: Linux

Linux

SVN Post Commit hook

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Some days ago, I got a requirement of giving access to 3 users to my SVN repo over ssh.

#groupadd dev
#useradd -g dev auser
#useradd -g dev buser
#useradd -g dev cuser

Then set the passwords for each user.

For SVN, update changes, you need to have the working copy owned by dev group

#chmod 0775 -R myworkingcopy
#chown -R apache:dev myworkingcopy

For svn post commit hook

#chown apache:dev post-commit
#chmod 0755 post-commit

The point here is that the user committing the changes should have the write permissions to the working copy and execute permissions on the post-commit hook

and all is good.

Installing python 2.7.1, mysql-pythondb and PIL (python Imaging Library) on centos

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yum -y install gcc gdbm-devel readline-devel ncurses-devel zlib-devel bzip2-develsqlite-devel db4-devel openssl-devel tk-devel bluez-libs-devel make

cd /var/tmp

wget http://www.python.org/ftp/python/2.7.1/Python-2.7.1.tgz

tar xvfz Python-2.7.1.tgz

cd Python-2.7.1

./configure --prefix=/opt/python2.7.1 --with-threads --enable-shared

make

make install
touch /etc/ld.so.conf.d/opt-python2.7.1.conf

echo "/opt/python2.7.1/lib/" >> /etc/ld.so.conf.d/opt-python2.7.1.conf

ldconfig
ln -sf /opt/python2.7.1/bin/python /usr/bin/python2.7
cd /var/tmp

wget http://pypi.python.org/packages/2.7/s/setuptools/setuptools-0.6c11-py2.7.egg

sh setuptools-0.6c11-py2.7.egg --prefix=/opt/python2.7.1
/opt/python2.7.1/bin/easy_install pip

ln -sf /opt/python2.7.1/bin/pip /usr/bin/pip
pip install virtualenv

ln -sf /opt/python2.7.1/bin/virtualenv /usr/bin/virtualenv
echo "alias python=/opt/python2.7.1/bin/python" >> ~/.bash_profile

echo "alias python2.7=/opt/python2.7.1/bin/python" >> ~/.bash_profile

echo "PATH=$PATH:/opt/python2.7.1/bin" >> ~/.bash_profile

source ~/.bash_profile
# install mysql python db

cd /var/tmp

pip install http://sourceforge.net/projects/mysql-python/files/mysql-python/1.2.3/MySQL-python-1.2.3.tar.gz/download

#install PIL

yum install libjpeg freetype

pip install http://effbot.org/downloads/Imaging-1.1.7.tar.gz

Spliiting a Huge text or CSV file into smaller chunks

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I got into a situation where i had to import a 10GB CSV file into mysql. I tried to open the file using excel, but it hanged and gave errors of Lesser Resources (RAM). 

Then I came to know about one less know tools of Linux shell called ‘csplit’.

I ran the command:

# csplit -k tenGB.csv +50000 {*}

-k = do not delete  the files on error encounter

+50000 = split to a new file after 49999 lines

{*} = repeat the same pattern on next files.

 

 

it created almost 43 files. with pattern xx00, xx01 and so on…

then i renamed all these files using the command:

#for f in *; do mv "$f" "${f%}.csv"; done

and thats it!!

Planner 0.14.4 complete progress issue

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I have been using the Planner for quite a long time. Its a very good software for Project Management and Planning. Over the time many improvements have been made in the project. The latest stable release you can find at http://live.gnome.org/planner is 0.14.4. I upgraded from 0.14.2 on my Vista Laptop. Everything is fine, however a strange thing I noted is that the complete progress of any task does not move beyond 75%. I tried on subtasks and individual tasks, but invain.

Finally, I consulted planner development team regarding this issue and Rhian Geleick guided me the temporary solution for the bug. The solution is

  1. Go to the installtaion directory of planner
    <INSTALL DIR>/share/planner/glade.
  2. Edit the file named ‘task-dialog.glade’ in this directory, in any of the text editors
  3. Goto Line number 236, and change
    <property name=”adjustment”>0 0 100 10 25 25</property>
    To
    <property name=”adjustment”>0 0 100 10 25 0</property>
  4. Anyone using the priority field should should also change line number 257
    From
    <property name=”adjustment”>0 0 9999 1 10 10</property>
    To
    <property name=”adjustment”>0 0 9999 1 10 0</property>
  5. Save the file and then Check in Planner. The bug is rectified.

Thanks for the Planner Team for their timely support.

Enable mod_rewrite in apache

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If you are using Windows OS and want to enable mod_rewrite module here is how to do it.
This is the general configuration guideline both for Windows and Linux server:

QUOTE

1. Find the httpd.conf file (usually you will find it in a folder called conf, config or something along those lines)
2. Inside the httpd.conf file uncomment the line LoadModule rewrite_module modules/mod_rewrite.so (remove the pound ‘#’ sign from in front of the line)
3. Also find the line ClearModuleList is uncommented then find and make sure that the line AddModule mod_rewrite.c is not commented out.

For Windows, find the following section in httpd.conf file:



DocumentRoot "C:/path/to/my/root"





# Each directory to which Apache has access, can be configured with respect



# to which services and features are allowed and/or disabled in that



# directory (and its subdirectories).



#



# First, we configure the "default" to be a very restrictive set of



# permissions.



#



Now modify the option for AllowOverride to look like this: 
<Directory /> 
Options All 
AllowOverride All 
</Directory>

					

		
		
	


				
					
	

		

						
Open rar file or Extract rar files under Linux or UNIX

			
						

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download binary package from official rarlab site: 
 $ cd /tmp 
 $ wget http://www.rarlab.com/rar/rarlinux-3.6.0.tar.gz


Untar file 
 $ tar -zxvf rarlinux-3.6.0.tar.gz


Both unrar and rar commands are located in rar sub-directory. Just go to rar directory: 
 $ cd rar 
 $ ./unrar


Now copy rar and unrar to /bin directory: 
 # cp rar unrar /bin


How to use unrar


unrar command supports various options below are common options that you need to use everyday.


Task: To open rar (unpack) file in current directory type command:


$ unrar e file.rar


Please note that replace file.rar filename with your actual filename.


Task: List (l) file inside rar archive:


$ unrar l file.rar


Task: To extract (x) files with full path type command:


$ unrar x file.rar


(D) To test (t) integrity of archive, file type command: 
 $ unrar t file.rar

					

		
		
	


				
					
	

		

						
PHP 5.3 upgrade in Centos 5.3

			
						

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I’ve finally figured out a way to install PHP 5.2.x instead of PHP 5.1 which installs on CentOS 5.3 by default. I’ve wanted to use phpMyAdmin 3.x but could not because of this. Now I can, and if you keep reading you will too. Note if you follow this how-to and do everything correctly you won’t even loose your current database. But I highly recommend you backup your database before you proceed.




First lets download this following repositories:


wget http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm

wget http://rpms.famillecollet.com/el5.i386/remi-release-5-8.el5.remi.noarch.rpm


## Lets remove old MySQL 5, will install newer version later.

yum remove mysql


## Now lets install them:

rpm -Uvh remi-release-5*.rpm epel-release-5*.rpm


## OK, Now you should be able to install PHP 5.2.9 without a problem =)

yum  – -enablerepo=remi update php-cli

OR

yum  – -enablerepo=remi update php*


(Note:     – - enablerepo has two dashes without space before it)


## Now install MySQL

yum –enablerepo=remi install mysql mysql-server

chkconfig -levels 235 mysqld on

service mysqld start


If you get the following error when you try starting newly installed MySQL;

shell-init: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory


## Now install PHP-MySQL module

yum –enablerepo=remi install php-mysql


1. Try restarting your web server;

service lighttpd restart

or

service httpd restart


2. Type this command:

cd /


3. Restart your mysql server;

service mysqld restart


## Set root and hostname passwords

mysqladmin -u root password ‘new_pass_here’

mysqladmin -h server.yourdomain.com -u root password ‘new_pass_here’


When it asks you to import signature, do it. press y and hit enter. It should ask you twice.


I use the first one because I don’t have Apache Web Server, I use LightTPD.


## Now run update on your system.

yum –enablerepo=remi update