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find dead processes

The 8th column of ps aux command will list the status of the process.

ps aux | awk '{if ($8 ~ "D") print $0}'

Here is a list of the various process statuses and what they mean:

D – Uninterruptible sleep (usually a critical system process, a process that cannot be killed without rebooting)
R – Running
S – Interruptible sleep (waiting for an event to complete)
T – Stopped
Z – Defunct (“zombie”) process

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connect to AWS

It is possible to use password to connect to AWS

1) change config file
sudo vi /etc/ssh/sshd_config

PermitRootLogin yes
PasswordAuthentication yes

2) restart
sudo service ssh restart

3) add a password
sudo passwd root

4) ssh without key
ssh root@xxx.com

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upgrade ubuntu

Upgrade from 14.04 to 15.04 is a 2 step journey.

sudo nano /etc/update-manager/release-upgrades
change the value to normal

And then use this command twice!
sudo do-release-upgrade

You can check your ubuntu version:

lsb_release -a
Description: Ubuntu 15.04

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Libre office on centOS

Here is how to install Libre office on centOS

64 bit
wget http://download.documentfoundation.org/libreoffice/stable/4.4.4/rpm/x86_64/LibreOffice_4.4.4_Linux_x86-64_rpm.tar.gz

32 bit
wget http://download.documentfoundation.org/libreoffice/stable/4.4.4/rpm/x86/LibreOffice_4.4.4_Linux_x86_rpm.tar.gz

tar xvf LibreOffice_4.4.4_Linux_x86_rpm.tar.gz

rpm -Uvh LibreOffice_4.4.4.3_Linux_x86_rpm/RPMS/*.rpm

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manage iso image file

Here is how you can open and copy files from an iso image.

mkdir /mnt/iso
mount -t iso9660 -o loop /root/Downloads/ubuntu-15.04-desktop-i386.iso /mnt/iso/

ls /mnt/iso/

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Creating a new repository

Create a new repository on the command line

touch README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin git@github.com:shantanuo/vivac.git
git push -u origin master

Push an existing repository from the command line

git remote add origin git@github.com:shantanuo/vivac.git
git push -u origin master

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Create a Reverse SSH Tunnel

on Remote server:
ssh -fN -R 7000:localhost:22 username@yourMachine-ipaddress

Now do an ssh connection request from your machine to your own machine at port 7000:
ssh username@localhost -p 7000

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avoid key prompt

Here is a simple tip that will avoid RSA key fingerprint authentication. Edit /etc/ssh/ssh_config for global configuration or ~/.ssh/config for user-specific configuration.

Host 192.168.0.*
StrictHostKeyChecking no
UserKnownHostsFile=/dev/null

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Killing mysql

Here are a few ways to kill mysql process.

mysqladmin shutdown
kill -TERM nnnn
killalll mysqld
kill -TERM `pidof mysqld`
kill -TERM `cat /var/run/mysqld.pid`

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More about git

## getting started
git init
git add index.html
git commit -m"my first commit"
git diff
git clone public_html my_website

# git log
git status
git log
git show xxx
git diff xxx

## branching out
git branch
gi branch dev
git show-branch --more=5
git checkout dev
git checkout HEAD index.html
git merge dev
git diff
git reset --mixed HEAD^
git reset --hard ORIG_HEAD
git branch -d dev

## add shortcuts
git config --global alias.show-graph 'log --graph --abbrev-commit --pretty=online'

## plumbing commands
git ls-files --stage
git ls-files --unmerged
git cat-file -p xxx
git reflog

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