A Computer Person Journey
To install netbeans 11.3 do “pkg install netbeans” on your root terminal. It will take time to download 292MB netbeans + 60MB openjdk8 packages. After done installing dont forget to set PATH and JAVA_HOME environment variables. Edit your .profile file on home directory and add /usr/local/openjdk8 to “PATH=xxx:/usr/local/openjdk8; export PATH” statement. Also create JAVA_HOME=/usr/local/openjdk8; export JAVA_HOME.
After installing dragonflybsd 5.8 on your laptop, you can install LXDE desktop using pkg command while connected to internet.
pkg install xorg
pkg install lxde-meta
edit your .xinitrc and put exec startlxde.
startx
Done !
A long ago article about dragonflybsd hammer file system working …
Trying this on my VirtualBox, after installing the new released dflybsd 5.8
login as root
pkg install xorg
pkg install xfce
edit .xinitrc on your home directory and fill it with “exec startxfce4”
startx
voila !
Now is 2020 and we face a terrible corona virus outbreak and after weeks of work from home eventually we will need to setup VPN connection from our laptop to office server or our client server.
How we do this vpn thing on linux ? On Debian 10 an enabled vpn support we can see from settings -> network as follow.
If you see a blank form then you need to install some packages. Open up terminal and sudo to your favorite shell. Mine is bash. Type sudo bash.
To install package you need type as follow :
apt-get install network-manager-vpnc
apt-get install network-manager-vpnc-gnome
apt-get install network-manager-l2tp
apt-get install network-manager-l2tp-gnome
apt-get install network-manager-pptp
apt-get install network-manager-pptp-gnome
apt-get install network-manager-openvpn
apt-get install network-manager-openvpn-gnome
If you are using L2TP with preshared key on windows 10 then need to set the key and advanced option of algorithms like below.
If everything is OK then you will have vpn enabled on your debian 10.
Good night!
Its a digital era now. Do you know 40 years ago how a computer or microprocessor looks like ? Its not to late to design your microprocessor, the heart of a computer.
A guy create processor from transistor.
http://www.megaprocessor.com/
Two guys create a TTL micro computer from around 50 logic ICs.
https://gigatron.io/
This guy also cool ! I learned a lot from his articles.
http://cpuville.com/
A resource for 6502 processor.
http://6502.org/
A serious book about stack machine also available.
https://users.ece.cmu.edu/~koopman/stack_computers/index.html
Now let me design my fetch unit state machine. Fun exercise to your brain !
To start arduino programming go to web site arduino.cc and download arduino IDE software for linux. Choose linux 32 or 64 bit depend on your installed linux.
Extract downloaded archive.
Install it using root user (execute install.sh from extracted folder).
Lets start with running tcl script below to try out some array command :
set ar(1) one
set ar(2) two
set ar(3) three
puts array_size:[array size ar]
puts array_get:[array get ar]
puts array_names:[array names ar]
foreach {key} [array names ar] {set x $ar($key); puts $x}
On example above we use 3 array subcommand : Continue reading “Tcl : Working with array”
Tcl array can be created by set command by specifying its key to array name.
From example above we define array named days with keys containing numbers and text values. If we try to do variable substitution with $days, it wont work. If we do variable substitution with key specified then it will work.
We can have text as array’s key. Tcl array is an associative array.
From sample above we know that a text key is case sensitive (ID is different with id).
Another way to create array is with array set command by passing list of key value pairs as 3rd parameter and array name as 2nd parameter.
Thats all how we create array in Tcl. Bye!
