Linux Notları

Step-by-step tutorial about setting up a password protected directory under Apache web server UNIX / Linux edition with the help of .htaccess files and related command line utilities.

$ git submodule add git://github.com/chneukirchen/rack.git rack Initialized empty Git repository in /opt/subtest/rack/.git/ remote: Counting objects: 3181, done. remote: Compressing objects: 100% (1534/1534), done. remote: Total 3181 (delta 1951), reused 2623 (delta 1603) Receiving objects: 100% (3181/3181), 675.42 KiB | 422 KiB/s, done. Resolving deltas: 100% (1951/1951), done.

function large_mv () { while read line1; do mv directory/$line1 ../directory2 done } ls -1 directory/ | large_mv

This tutorial is intended for developers who are familiar with PHP/MySQL, and want to learn how to use Google Maps with a MySQL database to create a store locator-type app. After completing this tutorial, you will have a database of locations and a webpage that lets a user enter their address and see markers on a map for the locations nearest to them, within a chosen distance restriction. Since the Maps API v3 is designed to work well on modern mobile browsers, this article will show how to create a website that displays nicely on them.

ssh-add ~/.ssh/id_rsa

In linux, when we copy big files, the file's content gets cached in RAM for fast access eventhough we might not need it later in RAM. We can forcefully clear the RAM cache using sysctl  sudo sync && sudo sysctl -w vm.drop_caches=3 && sudo sysctl -w vm.drop_caches=0  The above line is a combination of three commands  1. sync --> to ensure any pending cache is flushed onto disk  2. sysctl -w vm.drop_caches = 3 --> to clear all caches (pagecache and inode/dentry caches)  3. sysctl -w vm.drop_caches = 0 --> reset the drop_caches to no clearing