vaibhaw

## dynamic links to .so files
ldd libopenblas.so

## install gxx-4.8 and/or gxx-4.9 on Ubuntu 12.04 or Ubuntu 14.04
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 50
sudo apt-get install g++-4.9

vaibhaw

## System Monitoring Tools
# TODO - provide more useful flags
top
free -m
vmstat
iostat
iotop
sar
netstat

vaibhaw

## check url of git-repo
git remote -v
## change url of git-repo
git remote set-url origin <new-git-repo-url>
## colorize git output
# source: http://unix.stackexchange.com/a/44297/62741
# source: http://stackoverflow.com/a/13075208/925216
git config --global color.ui auto

## If 2FA is set in github, you have to generate an access token

vaibhaw

Optimizations

• https://wiki.gentoo.org/wiki/GCC_optimization
• https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
• http://www.rapidtables.com/code/linux/gcc/gcc-o.htm

Code Structure

• http://www.gamedev.net/page/resources/_/technical/general-programming/organizing-code-files-in-c-and-c-r1798

vaibhaw

http://unix.stackexchange.com/questions/112023/how-can-i-replace-a-string-in-a-files

vaibhaw

package com.test.lucene;

import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.util.Calendar;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;

vaibhaw

## debian package manager tips
# source: http://askubuntu.com/a/17829/258167
# source: http://askubuntu.com/a/423556/258167
# To check whether a package is installed or not:
dpkg -l
dpkg -l libprotobuf # OR
dpkg -l | grep libprotobuf
# Show the location where the package is installed
sudo dpkg -S libprotobuf

vaibhaw

## recursive search only in specific filetypes
grep -nr --include=<pattern> <string> <directory>
# grep -nr -i --include *.{cpp,hpp,java} "isequal" .
# grep -nr -i --include *.cpp --include *.hpp "isequal" .
 
## grep seach exact word
grep -r -i /^word$/ .

vaibhaw

-- To login into mysql through command line similar to connecting ssh hosts
-- write following options in your ~/.my.cnf file
-- Ref # http://dba.stackexchange.com/q/3889
[clientremote]
host=db_host_ip
user=db_username
password=db_password
database=db_schema

[clientlocal]

vaibhaw

// Random sampling

Q: http://stackoverflow.com/questions/136474/best-way-to-pick-a-random-subset-from-a-collection

A: http://stackoverflow.com/a/2564196/925216