linux – Page 33

Create a Bash file in Ubuntu

December 10, 2015

#!/bin/bash

References :

http://askubuntu.com/questions/223691/how-do-i-create-a-script-file-for-terminal-commands

Install Oracel Java on Linux

December 10, 2015

/usr/local/java/jdk1.8.0_66

sudo gedit /etc/profile

JAVA_HOME=/usr/local/java/jdk1.8.0_66
JRE_HOME=$JAVA_HOME/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.8.0_66/jre/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.8.0_66/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_66/bin/javaws" 1

sudo update-alternatives --set java /usr/local/java/jdk1.8.0_66/jre/bin/java
sudo update-alternatives --set javac /usr/local/java/jdk1.8.0_66/bin/javac
sudo update-alternatives --set javaws /usr/local/java/jdk1.8.0_66/bin/javaws

. /etc/profile

References :

http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux

Permit root login in SSH

December 10, 2015

Simply adding a password for root is not enough for Ubuntu 14.04 Server.

You also need to edit /etc/ssh/sshd_config, and comment out the following line:

PermitRootLogin without-password

Just below it, add the following line:

PermitRootLogin yes

Then restart SSH:

service ssh restart

References :

http://askubuntu.com/questions/469143/how-to-enable-ssh-root-access-on-ubuntu-14-04

Use SSH to Connect to a Remote Server

December 5, 2015

ssh remote_username@remote_host

References :

https://www.digitalocean.com/community/tutorials/how-to-use-ssh-to-connect-to-a-remote-server-in-ubuntu

Upgrade Ubuntu

December 5, 2015

At first you need to confirm that /etc/update-manager/release-upgrades file has the following line:

Prompt=normal

If Prompt has any other value e.g. lts or never, change it to Prompt=normal.

Now you can run the following command to upgrade your Lubuntu 14.04 to Lubuntu 14.10:

sudo do-release-upgrade

References :

http://askubuntu.com/questions/423942/change-password-on-root-user-and-user-account

Change user password in Linux

December 5, 2015

To change the root password:

sudo passwd

To change your user password:

passwd

To change other users password:

sudo passwd USERNAME

References :

http://askubuntu.com/questions/423942/change-password-on-root-user-and-user-account

Configure a loopback in linux

December 4, 2015

sudo nano /etc/network/interfaces

add the following at the bottom of the file

auto lo:1
iface lo:1 inet static
address 127.0.0.2
netmask 255.0.0.0
#network 127.0.0.0

then

sudo /etc/init.d/networking restart

References :

http://serverfault.com/questions/579435/arbitrary-loopback-ip-addresses-besides-127-0-0-1

Running programs in the background from Linux terminal

December 3, 2015


nohup command-name &

References :

http://www.cyberciti.biz/tips/nohup-execute-commands-after-you-exit-from-a-shell-prompt.html

Native file system watcher for Linux

November 27, 2015

for using with Jetbrains product like pycharm and idea :

The current limit can be verified by executing:

cat /proc/sys/fs/inotify/max_user_watches

It can be raised by adding following line to the /etc/sysctl.conf file:

fs.inotify.max_user_watches = 524288

or

echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf

… and issuing this command to apply the change:

sudo sysctl -p

Check if there is a file in /etc/sysctl.d with your parameter. These files override the /etc/sysctl.conf file

References
https://github.com/guard/listen/wiki/Increasing-the-amount-of-inotify-watchers
https://serverfault.com/questions/355520/after-reboot-debian-box-ignore-sysctl-conf-values

Ubuntu Multiarch

November 27, 2015

sudo dpkg --add-architecture i386