Commonly Used Linux Software

vim Most Commonly Used: Frequency from High to Low

A level

• i: insert mode

• :wq: save and exit

• yy: copy entire line

• dd: delete current line and add to clipboard

• p: paste from clipboard

• o: insert line after current line

• 0: move cursor to beginning of line

• $: move cursor to end of line

• gg: move cursor to first line

• G: move cursor to last line

• u: undo

• C-r: redo

• Search for str1 and replace with str2: %s/str1/str2/g (this is quite useful)

B level

• gg: move cursor to top of page

• :e: open a file

• :saveas: save as

• :q!: quit without saving

• Multi-line copy

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Press v to enter visual mode; press y to copy; press p to paste

Copy lines 9 to 15 to line 16
:9,15 copy 16

vimium (Browser Tool)

gg: go to top of page G: go to bottom of page d: scroll down one page u: scroll up one page f: open link in current page F: open link in new page

Multi-window Management Tool Screen

Most Commonly Used Commands

• Create new window session

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screen or screen -S yourname

• Reconnect to session

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screen -r <screen_pid>

Note: If you cannot enter session after unexpected disconnection, you need:

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screen -D -r <screen_pid>

View all screen sessions

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screen -ls

• Temporarily disconnect session

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control+A d

• Stop current window

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control+A k

• Clear dead sessions:

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screen -wipe

virtualenv Environment Management

• Installation

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pip install virtualenv

Create virtual environment for project

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$ cd project_dir
$ virtualenv venv_name
Choose python interpreter for environment:
$ virtualenv -p /usr/bin/python2.7 venv_name

Use virtual environment:

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$ source venv_name/bin/activate

• Deactivate virtual environment

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$ . venv_name/bin/deactivate

anaconda

• Download anaconda

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$ wget anaconda_latest_version_url

• Install anaconda

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$ bash anaconda_latest_version

• Configure environment variables

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echo 'export PATH="~/your_anaconda_version/bin:$PATH"' >> ~/.bashrc
source ~/.bashrc

• Conda environment management

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# Create environment
conda create --name your_env_name python=your_python_version
# Activate environment
source activate your_env_name
# Deactivate environment
deactivate your_env_name
# Delete environment
conda remove -name your_env_name --all
# View installed environments
conda info -e

JupyterNotebook

Famous software. I usually use Pycharm as my IDE. However, recently while studying Yjango’s code, I discovered that JupyterNotebook has unique advantages in demonstration and teaching (cell functionality).

Command Mode Common Instructions

• jupyter notebook: Open jupyternotebook from console

• Enter: enter edit mode

• Shift-Enter: run cell, automatically jump to next cell

• Ctrl-Enter: run cell

• y: cell enters code mode

• m: cell enters markdown mode

• a: insert cell above

• b: insert cell below

• z: restore last deleted cell

• dd: delete selected cell

• s: save file

matplotlib Integration

Adding the following code at the top of the file allows images to be displayed in the code. This operation saves the trouble of closing a bunch of images at once.

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%matplotlib inline

Commitizen

This small tool is specifically designed to reduce the feeling of being at a loss for words when doing commit -m and the feeling of helplessness during code review.

1. Installation (mac environment)

• brew install node Install nodeJS

• cnpm install -g commitizen Use cnpm to globally install commitizen

• cnpm install -g

2. Usage

• cnpm install -g cz-conventional-changelog Load Angular specification template file

• echo '{ "path": "cz-conventional-changelog" }' > ~/.czrc Use Angular specification template file

• git cz is equivalent to git commit -m

3. Advanced Usage

• First step fill in type

• feat: new feature

• fix: fix bug

• doc: documentation change

• style: code format change

• refactor: refactoring of an existing feature

• perf: performance optimization

• test: add tests

• Second step fill in scope: This is the scope, recommended options are as follows

• $all: indicates large impact area, such as modifying the project framework will affect the entire program. Or global files

• $loation: indicates small impact, some small features

• $module: indicates will affect certain modules such as login module, homepage module, user management module, etc.

• Custom is also an option, but must start with $

• Third step fill in other information:

• subject: briefly describe this change

• body: specific modification information should be as detailed as possible

• footer: place notes, if it’s a bug, you can put the bug id

4. Final Stage Usage

Generate Change log:

• cnpm install -g conventional-changelog-cli First install client

• conventional-changelog -p angular -i CHANGELOG.md -s -r 0 Directly generate log file

Linux Database Common Commands

mysql

• Start mysql service

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mysql.server start

• Open mysql

mysql -u root -p

References and citations

• https://www.cnblogs.com/technologylife/p/6635631.html

• https://www.wangjingxian.cn/linux/41.html

• https://www.cnblogs.com/ctaodream/p/6066694.html

• http://www.ruanyifeng.com/blog/2016/01/commit_message_change_log.html