Make Symbolic link for mirror Rsync

Symbolic link : atmail
Real Directory : atmaildata

atmail -> atmaildata

1. rename the existing directory name (main and mirror server).
mv atmail atmaildata


2. modify the rsync.sh in the main server.
vi rsync.sh
change /usr/local/atmail --> /usr/local/atmaildata


3. change own for the symbolic link (main and mirror server).
chown -h atmail:atmail atmail


MySQL Commands

http://www.pantz.org/software/mysql/mysqlcommands.html

This is a list of handy MySQL commands that I use time and time again. At the bottom are statements, clauses, and functions you can use in MySQL. Below that are PHP and Perl API functions you can use to interface with MySQL. To use those you will need to build PHP with MySQL functionality. To use MySQL with Perl you will need to use the Perl modules DBI and DBD::mysql.

Below when you see # it means from the unix shell. When you see mysql> it means from a MySQL prompt after logging into MySQL.

To login (from unix shell) use -h only if needed.

# [mysql dir]/bin/mysql -h hostname -u root -p

Create a database on the sql server.

mysql> create database [databasename];

List all databases on the sql server.

mysql> show databases;

Switch to a database.

mysql> use [db name];

To see all the tables in the db.

mysql> show tables;

To see database's field formats.

mysql> describe [table name];

To delete a db.

mysql> drop database [database name];

To delete a table.

mysql> drop table [table name];

Show all data in a table.

mysql> SELECT * FROM [table name];

Returns the columns and column information pertaining to the designated table.

mysql> show columns from [table name];

Show certain selected rows with the value "whatever".

mysql> SELECT * FROM [table name] WHERE [field name] = "whatever";

Show all records containing the name "Bob" AND the phone number '3444444'.

mysql> SELECT * FROM [table name] WHERE name = "Bob" AND phone_number = '3444444';

Show all records not containing the name "Bob" AND the phone number '3444444' order by the phone_number field.

mysql> SELECT * FROM [table name] WHERE name != "Bob" AND phone_number = '3444444' order by phone_number;

Show all records starting with the letters 'bob' AND the phone number '3444444'.

mysql> SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number = '3444444';

Show all records starting with the letters 'bob' AND the phone number '3444444' limit to records 1 through 5.

mysql> SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number = '3444444' limit 1,5;

Use a regular expression to find records. Use "REGEXP BINARY" to force case-sensitivity. This finds any record beginning with a.

mysql> SELECT * FROM [table name] WHERE rec RLIKE "^a";

Show unique records.

mysql> SELECT DISTINCT [column name] FROM [table name];

Show selected records sorted in an ascending (asc) or descending (desc).

mysql> SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;

Return number of rows.

mysql> SELECT COUNT(*) FROM [table name];

Sum column.

mysql> SELECT SUM(*) FROM [table name];

Join tables on common columns.

mysql> select lookup.illustrationid, lookup.personid,person.birthday from lookup left join person on lookup.personid=person.personid=statement to join birthday in person table with primary illustration id;

Creating a new user. Login as root. Switch to the MySQL db. Make the user. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> INSERT INTO user (Host,User,Password) VALUES('%','username',PASSWORD('password'));
mysql> flush privileges;

Change a users password from unix shell.

# [mysql dir]/bin/mysqladmin -u username -h hostname.blah.org -p password 'new-password'

Change a users password from MySQL prompt. Login as root. Set the password. Update privs.

# mysql -u root -p
mysql> SET PASSWORD FOR 'user'@'hostname' = PASSWORD('passwordhere');
mysql> flush privileges;

Recover a MySQL root password. Stop the MySQL server process. Start again with no grant tables. Login to MySQL as root. Set new password. Exit MySQL and restart MySQL server.

# /etc/init.d/mysql stop
# mysqld_safe --skip-grant-tables &
# mysql -u root
mysql> use mysql;
mysql> update user set password=PASSWORD("newrootpassword") where User='root';
mysql> flush privileges;
mysql> quit
# /etc/init.d/mysql stop
# /etc/init.d/mysql start

Set a root password if there is on root password.

# mysqladmin -u root password newpassword

Update a root password.

# mysqladmin -u root -p oldpassword newpassword

Allow the user "bob" to connect to the server from localhost using the password "passwd". Login as root. Switch to the MySQL db. Give privs. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> grant usage on *.* to bob@localhost identified by 'passwd';
mysql> flush privileges;

Give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> INSERT INTO user (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv) VALUES ('%','databasename','username','Y','Y','Y','Y','Y','N');
mysql> flush privileges;

or

mysql> grant all privileges on databasename.* to username@localhost;
mysql> flush privileges;

To update info already in a table.

mysql> UPDATE [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [field name] = 'user';

Delete a row(s) from a table.

mysql> DELETE from [table name] where [field name] = 'whatever';

Update database permissions/privilages.

mysql> flush privileges;

Delete a column.

mysql> alter table [table name] drop column [column name];

Add a new column to db.

mysql> alter table [table name] add column [new column name] varchar (20);

Change column name.

mysql> alter table [table name] change [old column name] [new column name] varchar (50);

Make a unique column so you get no dupes.

mysql> alter table [table name] add unique ([column name]);

Make a column bigger.

mysql> alter table [table name] modify [column name] VARCHAR(3);

Delete unique from table.

mysql> alter table [table name] drop index [colmn name];

Load a CSV file into a table.

mysql> LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name] FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' (field1,field2,field3);

Dump all databases for backup. Backup file is sql commands to recreate all db's.

# [mysql dir]/bin/mysqldump -u root -ppassword --opt >/tmp/alldatabases.sql

Dump one database for backup.

# [mysql dir]/bin/mysqldump -u username -ppassword --databases databasename >/tmp/databasename.sql

Dump a table from a database.

# [mysql dir]/bin/mysqldump -c -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql

Restore database (or database table) from backup.

# [mysql dir]/bin/mysql -u username -ppassword databasename < /tmp/databasename.sql

Create Table Example 1.

mysql> CREATE TABLE [table name] (firstname VARCHAR(20), middleinitial VARCHAR(3), lastname VARCHAR(35),suffix VARCHAR(3),officeid VARCHAR(10),userid VARCHAR(15),username VARCHAR(8),email VARCHAR(35),phone VARCHAR(25), groups VARCHAR(15),datestamp DATE,timestamp time,pgpemail VARCHAR(255));

Create Table Example 2.

mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'bato');

Change own for Symbolic Link

To change the group ownership of symbolic link, simply use the -h or –no-dereference flag to the chgrp command.

Example:

chgrp -h new_group symbolic_link_name

chown -h sam:sam link_name

Fedora 10 - Plymouth Graphical Boot


http://www.my-guides.net/en/content/view/125/26/1/12/#plymouth


Plymouth Graphical Boot

Plymouth is the new Graphical Boot of Fedora 10 which replaces the old RHGB. It requires kernel modesetting (KMS) support to work properly. KMS is currently supported on most ATI Radeon chips; anything from the Radeon 9500 and newer should work. Intel KMS support is in development, but is not yet supported. For all other graphics hardware, the text plugin is used. If you see only a scrolling bar when booting to Fedora you can try to force your Hardware into graphics mode without using KMS support. To do so reat below at the Graphical Boot Problem. However you could first try and change this theme to another one to see if it works without any changes to your grub.conf.

* Plymouth Themes

By default only the solar and text themes are installed. To add additional plymouth themes type:


yum install plymouth-plugin-{fade-in,pulser,spinfinity}


Now you can try any theme you want like this. Just replace pluginname with one of the following: solar, fade-in, pulser, spinfinity, text.


plymouth-set-default-plugin pluginname
/usr/libexec/plymouth/plymouth-update-initrd


After that just reboot your computer.

* Graphical Boot Problem

While booting in Fedora 10 you might have seen a blue scrolling bar loading instead of the grub's graphical boot screen. This has happened because of the modesetting option of the kernel that Fedora 10 uses. In order to see the graphical boot you must edit grub.conf and add a vga resolution to it. Here it is how:


gedit /boot/grub/grub.conf


Here you must add your framebuffer resolution at the end of the kernel line. Something like this:


title Fedora (2.6.27.5-117.fc10.i686)
root (hd0,9)
kernel /boot/vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=a61c8338-e373-4389-ae00-32942185f7c2 rhgb quiet vga=792
initrd /boot/initrd-2.6.27.5-117.fc10.i686.img


vga=792 stands for 1024x768 resolution with 24-bit colours. You can find the resolution you like from here . Just look at the second table.

Install VBoxLinuxAdditions and set full screen

1. install VBoxLinuxAdditions

type bellow in terminal.


yum install kernel
yum install kernel-devel


cd /media/VirtualBox_1.5.6_Guest_Additions

sh ./VBoxLinusAdditions.run / sudo ./VBoxLinusAdditions.run



reboot

2. set full screen

make sure the VirtualBox Linux resolution is same as Windows.

- change the Linux monitor to "monitor 1200*1024"

a. in linux, System -> Administration -> Display
b. in Display windows -> Hardware -> Monitor -> "Generic ..." -> "1280*1024"
c. after reboot, press "host key(e.g. alt) + F" to switch the full screen.