Tuesday, May 29, 2012

rsync Command

rsync is used to perform the backup operation in UNIX / Linux. rsync utility is used to synchronize the files and directories from one location to another in an effective way.  

Example Synchronize Files From Local to Remote using shell(ssh with port)
rsync -avzi -e "ssh -p 2445" /var/lib/ldap/ username@

Example : Synchronize Files From Remote to Local

rsync -avz username@ /root/temp

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Saturday, May 19, 2012

Filter mail with postfix header_checks

First up under /etc/postfix ensure that you have a file called header_checks. If not create it.
Next we want to ensure Postfix is configured to use this file so you do this from a command line by entering the following:
postconf -e "header_checks = regexp:/etc/postfix/header_checks"
The syntax in the header_checks file is:
/regex_pattern/ ACTION
Example :

/^From: "spam/ REJECT

/^To: example@example.com/ REDIRECT @esxe.com

/^Subject:.*viagra/ DISCARD
More Detail Link 1 Link 2

PHP : mysql_real_escape_string() function

The mysql_real_escape_string() function escapes special characters in a string for use in an SQL statement
The following characters are affected
Syntax : mysql_real_escape_string(string,connection)
string : Required. Specifies the string to be escaped
connection  : Optional. Specifies the MySQL connection. If not specified, the last connection opened by mysql_connect() or mysql_pconnect() is used.

Example :
// Connect$link mysql_connect('mysql_host''mysql_user''mysql_password')    OR die(mysql_error());
// Query$query sprintf("SELECT * FROM users WHERE user='%s' AND password='%s'",