linux command sheet

linux.sh

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##os-centos-7##

#get centos version
$cat /etc/centos-release

#get system info
$hostnamectl

#get kernel
$uname -a
$yum info kernel -q

#get installed package (i.e. filter to only postgresql packages)
$sudo yum list installed | grep postgresql
#List Installed Packages with Rpm
$sudo rpm -qa | grep postgresql
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#vnc remote to ubuntu
Installing the Desktop Environment and VNC Server
sudo apt update
sudo apt install xfce4 xfce4-goodies
sudo apt install tightvncserver
vncserver//set a VNC access password
vncpasswd//change a VNC access password
vncserver -kill :1
mv ~/.vnc/xstartup ~/.vnc/xstartup.bak //Before you modify the xstartup file, back up the original
//Now create a new xstartup file and open it in a text editor, such as nano:
nano ~/.vnc/xstartup
//Then add the following lines to the file:
#!/bin/bash
xrdb $HOME/.Xresources
startxfce4 &
//Save and close the file after adding these lines. If you used nano, do so by pressing CTRL + X, Y, then ENTER.
chmod +x ~/.vnc/xstartup//To ensure that the VNC server will be able to use this new startup file properly, you’ll need to make it executable:
//Then restart the VNC server:
vncserver -localhost //Notice that this time the command includes the -localhost option, which binds the VNC server to your server’s loopback interface. This will cause VNC to only allow connections that originate from the server on which it’s installed.
//In the next step, you’ll establish an SSH tunnel between your local machine and your server, essentially tricking VNC into thinking that the connection from your local machine originated on your server. This strategy will add an extra layer of security around VNC, as the only users who will be able to access it are those that already have SSH access to your server.

ssh -L 59000:localhost:5901 -C -N -l sammy your_server_ip //Create an SSH connection on your local computer that securely forwards to the localhost connection for VNC. You can do this via the terminal on Linux or macOS with the following ssh command:
//https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-vnc-on-ubuntu-20-04

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#GUI Install a Desktop Environment/GUI in Ubuntu Server 

1-sudo apt update && apt upgrade
2-install desktop environment(one of these):
2-sudo apt-get install xfce4-session xfce4-goodies
2-sudo apt install ubuntu-mate-desktop
2-sudo apt install lxde
2-sudo apt install kde-plasma-desktop
2-For the vanilla GNOME experience
2-sudo apt install vanilla-gnome-desktop vanilla-gnome-default-settings
2-sudo apt install ubuntu-desktop
2-sudo apt install ubuntu-mate-core
2-sudo apt install xubuntu-core
3-display manager 
3-sudo apt install lightdm
4-Setting Up LightDM
4-start the LightDM service with systemctl
4-sudo systemctl start lightdm.service
4-start the LightDM service using the service utility
4-sudo service ligthdm start
5-Remove GUI From Ubuntu Server
5-sudo apt remove [display-manager] [desktop-environment]
5-Reboot the system and log back in.
5-Finish by removing orphaned or unnecessary dependencies with autoremove
5-sudo apt autoremove ubuntu-desktop
5-sudo systemctl stop lightdm.service
5-sudo apt autoremove lightdm

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#environment setup for grails on ubuntu 9.10 
#!/bin/bash
#environment setup for grails on ubuntu 9.10
#use the source "$ source env.sh"
export GRAILS_HOME=/home/tim/programs/grails-1.3.1
export PATH=$PATH:$GRAILS_HOME/bin
export JAVA_HOME=/usr/lib/jvm/default-java

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#Create Image drawable for all resolutions 
if [ $# -eq 0 ]; then
	echo "No arguments supplied"
else if [ -f "$1" ]; then
	echo " Creating different dimensions (dips) of "$1" ..."
	mkdir -p drawable-xxhdpi
	mkdir -p drawable-xhdpi
	mkdir -p drawable-hdpi
	mkdir -p drawable-mdpi

	if [ $1 = "ic_launcher.png" ]; then
	    	echo "  App icon detected"
		convert ic_launcher.png -resize 144x144 drawable-xxhdpi/ic_launcher.png
		convert ic_launcher.png -resize 96x96 drawable-xhdpi/ic_launcher.png
		convert ic_launcher.png -resize 72x72 drawable-hdpi/ic_launcher.png
		convert ic_launcher.png -resize 48x48 drawable-mdpi/ic_launcher.png
		rm -i ic_launcher.png
	else
		convert $1 -resize 67% drawable-xhdpi/$1
		convert $1 -resize 50% drawable-hdpi/$1
		convert $1 -resize 33% drawable-mdpi/$1
		mv $1 drawable-xxhdpi/$1
	fi
	echo " Done"
else
	echo "$1 not found."
fi
fi
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# strip non-existent files from monodevelop project file 
#!/bin/bash
#strip non-existent files from monodevelop project file
projectFile=$1 #first arg should be the .mdp file to process
if [ "$1" == "" ]
then
	echo "usage: $0 project.mdp"
	exit 1
fi
#set IFS to allow processing of files with spaces.
#ref http://tldp.org/LDP/abs/html/internalvariables.html
# http://www.cyberciti.biz/tips/handling-filenames-with-spaces-in-bash.html
IFS=$(echo -en "\n\b")
for f in `grep '<File' "$projectFile" | perl -pe 's|.*name="(.*?)".*|\1|'`
do
	if [ ! -e "$f" ]
	then
		echo "'$f' doesn't exist, removing from project..."
		escapedFile=`echo $f | sed -e 's/\//\\\\\//g'`
		sed -i "/$escapedFile/d" $projectFile
	fi
done
echo "done."
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# ubuntu install 
#binary format file
chmod +x ~/downloads/filename.bin
sudo ~/downloads/filename.bin

#debian package format file 
sudo dpkg -i filename.deb
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