gnome builder

Install flatpak package sudo add-apt-repository ppa:alexlarsson/flatpak sudo apt update sudo apt install flatpak
Install gnome builder via flatpak flatpak install --from https://git.gnome.org/browse/gnome-apps-nightly/plain/gnome-builder.flatpakref $ flatpak run org.gnome.Builder

cx_Freeze - make python program executable

• Intro.

cx_Freeze is tool for making your python program as executable program under Linux, Mac OS and Windows operating system (similar with pyinstaller) I couldn't make it work well with one of my PyQt project. pyinstaller is my top choice of this kind tools.


• Installation

pip install cx_freeze

• Get started with cx_freeze

simply create a setup.py under your working directory and run below command to create executable program python setup.py build For the details of setup.py, please click below link to get the reference example http://cx-freeze.readthedocs.io/en/latest/distutils.html

pyinstaller - make python program executable

• Installation
pip install pyinstaller
• Run pyinstaller
switch to your program directory
pyinstall your_program.py if you get the error message of "pyinstaller: command not found", you'd need to find out the installed path of pyinstaller
sudo find / -name pyinstaller modify ~/.profile as your environment PATH variable
$PATH = $PATH:/my/path/to log-out and login your account, it might works now!

• Reference
http://www.pyinstaller.org/

opencc - open chinese convert

install opencc via apt sudo apt install opencc
example for convert chs to cht
opencc -i "input.txt" -o "output.txt"

Install python3.6 on Ubuntu 16.04

sudo add-apt-repository ppa:jonathonf/python-3.6
sudo apt update
sudo apt install python3.6
sudo apt install python3.6-dev
sudo apt install python3.6-venv
wget https://bootstrap.pypa.io/get-pip.py
sudo python3.6 get-pip.py
sudo ln -s /usr/bin/python3.6 /usr/local/bin/python3
sudo ln -s /usr/local/bin/pip /usr/local/bin/pip3


type python3 and pip3 -V to get version information

Linux Command Line without Password

Edit /etc/sudoers and insert below statement at the end of this file

username ALL=(ALL) NOPASSWD: ALL

imagemagick - add date on image

Install

sudo apt install imagemagick

example for batch mark date on images

for img in *.jpg;
do convert "$img" -gravity SouthEast -pointsize 64 -fill white -annotate +30+30 %[exif:DateTimeOriginal] "time_""$img";
done

Atom - source editor

Atom - excellent source editor under Linux, the most import thing is it's "FREE"

Install

sudo add-apt-repository ppa:webupd8team/atom sudo apt-get update sudo apt-get install atom

Ignored names (useful for search)

.git, .hg, .svn, .DS_Store, ._*, Thumbs.db, *.txt, *.tags, tags, *.stack, _out, *.htm, *.lst, .tags1

Best Packages for developers

Atom-ctags
Atom Beautify
File-icons
Highlight-line
Highlight-selected
Project-Manager
Symbol-tree-view
Terminal-plus
Vertical-tabs
Merge-conflicts
Todo-show
git-blame

SSD Optimization under Ubuntu

Reduce flush frequency

Add "noatime" on /etc/fstab UUID=f0ae2c59-83d2-42e7-81c4-2e870b6b255d / ext4 noatime,errors=remount-ro 0 1

Reserve some space for Over-provision

leave at least 7% capacity size for unformatted. (14 % is better)

Enable TRIM suuport

By default, Ubunut 16.04 will support trim operation automatically, but you could perform it manually

Reference

https://sites.google.com/site/easylinuxtipsproject/ssd

PS. Trust me, I have over 6 years experience on SSD firmware development.

Static code analysis - flawfinder

Unlike cpecheck, flawfinder will looking for the security vulnerability of your source code

Install

sudo apt install flawfinder

Run flawfinder

flawfinder --html --quiet --dataonly . >> output.html

Reference

https://security.web.cern.ch/security/recommendations/en/codetools/flawfinder.shtml

Static code analysis - cppcheck

Great static code analysis tool for C/C++ programming language

Install

sudo apt install cppcheck

Run cppcheck and redirect result to output file

cppcheck --enable=all --force -j4 . 2> output

run cppcheck with html report

cppcheck --enable=all --inconclusive --xml-version=2 --force --library=windows,posix,gnu [PATH_TO_SOURCE] 2> result.xml && cppcheck-htmlreport --title="Your Project Name" --source-dir=[PATH_TO_SOURCE] --report-dir=[OUTPUT_DIR] --file=result.xml && rm result.xml Would like to try latest version of cppcheck? just clone the source from github https://github.com/danmar/cppcheck.git for more detailed information, please visit the home page https://github.com/danmar/cppcheck

Reference

https://sites.google.com/site/opensourceconstriubtions/ettl-martin-1/tutorials/how-to-generate-an-html-report-with-doxygen-using-the-linux-command-line-interface

Run 32 Bits program on Ubuntu 64 Bits

Sometimes, you might need to run 32 bits program under 64 bits environment. Here are the packages you need sudo apt install primus-libs-ia32 sudo apt install gcc-multilib sudo apt install lsb

hdparm - Sorage Device Configuration Tool

Official Website: hdparm

hdparm is a powerful and open source storage device configuration tool under Unix/Linux system. Here are the parameters I frequently used.

• Identify Devicehdparm -I /dev/sdb
• SecureErase hdparm --user-master u --security-set-pass p /dev/sdb
  hdparm --user-master u --security-erase p /dev/sdb
  hdparm --user-master u --security-unlock p /dev/sdb
  hdparm --user-master u --security-disable p /dev/sdb
• Set Maximum Sector (84GB / 128GB)hdparm -N p164115504 --yes-i-know-what-i-am-doing /dev/sdb

To pursue higher performance, storage device might implement data caching (store in the internal DRAM). However, it might have the risk of data loss, especially when a power failure occurred. For data protection purpose, we could disable write cache to prevent data loss disaster. Here are the steps for disabling write cache.
Disable Write Cache(Assume your device mounted on /dev/sdb) hdparm -W 0 /dev/sdb Enable Write Cache hdparm -W 1 /dev/sdb Once you disable the write cache, the performance will drop sharply!!!

Linux S3/S4 testing tool - rtcwake

Source: lpmt.c

If you are looking for a S3/S4 testing program under Linux OS. Here is a simple example to demonstrate how to do it by rtc

Compile:
gcc -o lpmt lpmt.c

Run:  (S3 for 100 cycles)
sudo ./lpmt S3 100
use it at your own risk :)

Ubuntu menu editor - alacarte

very useful tool sudo apt install alacarte

Equation Editor: LaTeX - Equalx

Install qeualx sudo apt install equalx List of LaTeX mathematical symbols

Ubuntu module blacklist

Edit blacklist.conf sudo gedit /etc/modprobe.d/blacklist.conf Add below statement at the end of the blacklist.conf blacklist [module name] Update ramfs and reboot sudo update-initramfs -u sudo reboot

Linux and Unix grep command

memo for frequently used command grep -nr "pattern you looking for" . Linux and Unix grep command

[Ubutnu] analyze system boot time

Simply execute the following command to see the detailed boot up time systemd-analyze blame

[Ubutnu] Create bridged network for qemu

Simple way to create bridged network between Ubuntu host and qemu client Install bridge-utils package first. sudo apt-get install bridge-utils Edit /etc/network/interfaces, and append the following configurations. Add a bridged network (br0) to your host network adapter (eth0)
------------------------
auto br0
iface br0 inet dhcp
 bridge_ports eth0
 bridge_stp off
 bridge_fd 0
 bridge_maxwait 0
------------------------
Restart your network. sudo /etc/init.d/networking restart Edit your script to boot qemu client, here is an example (-net nic, -net bridge,br=br0) qemu -net nic, -net bridge,br=br0 you are now ready to boot your qemu client with bridged network