Insert/Add String to Beginning of a File

Inserting a String to Beginning of File

  1. Suppose you had a text file with the contents and you wanted to insert a string to the beginning:
    1st line
    2nd line
    3rd line
  2. Run the command:
    sed -i '1s/^/<add text > \n/' file.txt
  3. Now the file will look like this:
    Top of the file!
    1st line
    2nd line
    3rd line

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Connect to a different port with SQL Server Management Studio

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Microsoft's SQL Server Management Studio will connect by default to port 1433 and there's nowhere in the connect dialog to specify a different port from the default. To connect using a different port specify the servername, a comma, and then the port number as shown in this post. Connect using a different port using a comma The connection dialog in the SQL Server Management Studio client is shown in the screenshot below. Normally you would just type the server name into field but to specify a different port use a comma then the port number. The example screenshot above shows " 192.168.50.166\SQLSERVER2012 " as the instance name and "port" where the port would be. 192.168.50.166\SQLSERVER2012,1343 Then specify the login credentials, click the connect button, and assuming everything is correct it should then connect to the SQL Server. Setup specific port for SQL Server: Link: http://msdn.microsoft.com/en-us/library/ms177440.aspx
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CLEANING UP THE ZABBIX DATABASE

My Zabbix database size increased a lot in the last few months and since my disk was running out space, I decided to clean up the old events from the database. Looking at the database tables, the biggest one was  history_uint , which holds the items history data – over 400 millions of records and over 30 Gb of disk space before the clean up. Since deleting the old records from this table directly would be a very slow process, I decided to create a new table and insert the latest records from the  history_uint  table and then just replace the old table with a new one. Since this is not an offical procedure, use it at your own risk. Environment: Zabbix v2.2 MySql 5.1 – InnoDB with  innodb_file_per_table=ON Step 1 – Stop the Zabbix server Step 2 – Open your favourite MySQL client and create a new table CREATE TABLE  history_uint_new  LIKE  history_uint; Step 3 – Insert the latest records from the  history_uint  table to the...
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[OpenSSL] Sign server and client certificates with Certificate Authority

Sign server and client certificates We will be signing certificates using our intermediate CA. You can use these signed certificates in a variety of situations, such as to secure connections to a web server or to authenticate clients connecting to a service. Note The steps below are from your perspective as the certificate authority. A third-party, however, can instead create their own private key and certificate signing request (CSR) without revealing their private key to you. They give you their CSR, and you give back a signed certificate. In that scenario, skip the  genrsa  and  req  commands. Create a key Our root and intermediate pairs are 4096 bits. Server and client certificates normally expire after one year, so we can safely use 2048 bits instead. Note Although 4096 bits is slightly more secure than 2048 bits, it slows down TLS handshakes and significantly increases processor load during handshakes. For this reason, most websites use 2048-...
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