07, Jul 2024

WILY (What I Learnt Yesterday)

2024

07, Jul 2024

2024-07-01

Vim Learnings

Scripts:

Echoing Messages :: :ec or :echo prints out the message, example :ec "hello world"
Persistent Echoing:: :echom "<message>" or :echomsg "<message>", stores these messages in the message history
Help :: :help <commandname>

Keybinding:

Keybinding x: deletes the character next to the cursor
Deletion: dd: deletes the entire line
Deletes a word: dw, from the cursor until the space is found
Deletes characters till EOL: d$ deletes characters from the right of the cursor to the End of the Line

Deletion on Operators and motions: takes the form of d motion

list of motions: w: until the start of next word, excluding the first character e: to the end of the current word, including the last character $: to the end of the line

In case of deletion with motions: dw: deletes the word until the start of next word de: deletes until end of the current word d$: deletes until end of line

Count with motion: 2w: moves the cursor two words forward 4e: moves the cursor 4 words to the end of fourth word forward.

Deletion with count and motion: d2w: deletes two words until the start of the next word d2e: deletes two words until the last character of the second character

Lines: dd: deletes the entire line d2d: count with deletion of two lines

Undo & Redo u: Undoing the latest change CTRL+R: Redoing the latest change

Vim Learning Resources [1] https://learnvimscriptthehardway.stevelosh.com/ [2] https://vim-adventures.com/ [3] vimtutor

2024-07-02

rsync: stands for remote sync, which is used for remote and local file synchronization, alternative to ssh,scp
1. Local to Local
2. Local to Remote
3. Remote to Local

-a: option to sync files recursively -P: option to show the progress of the transfer

zimfw change theme Install zsh before installing zimfw curl -fsSL https://raw.githubusercontent.com/zimfw/install/master/install.zsh | zsh

2024-07-03

Vim Learnings

Keybindings

Put command:

p: put/paste the deleted text, after the text cursor

Replace Command:

r<character>: replace command, for example the word typod where o has to be replaced with e to make it typed, move the cursor to the start of the character to be placed(until o) and type re to replace o with e.

Change Command: delete all the characters from the cursor till the end of the word.

ce: VNKLO, move the cursor to the right ofV and input ce,which deletes all the characters till the end, and type in the required characters.

Internet Protocol

IPV4

32bit integers,represented in 4 numbers separated by . and the numbers are ranging from 0-255. 192.168.1.1: example of IPV4 address.

Drawbacks:

Limited Address space
Complex configuration: IPv4 requires mannual configuration or DHCP to assign address.
Fragmentation: IPv4 allows to fragment packets,chances of packets getting lost.

IPV6

To support increased use of computer networks, internet enabled devices, ipv6 was invented.

Enhanced packet header for efficient routing.
Data security through IPSec header field.

Ipv6 address representation as x:x:x:x:x:x:x:x,where x is the hexadecimal values of eight 16digit pieces. Ipv6 addresses ranges from: 0000:0000:0000:0000:0000:0000:0000:0000 to ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Shorthand formats of IPV6 addresses.

Omit leading zeros Specify IPv6 addresses by omitting leading zeros. For example, IPv6 address 1050:0000:0000:0000:0005:0600:300c:326b can be written as 1050:0:0:0:5:600:300c:326b.
Double colon Specify IPv6 addresses by using double colons (::) in place of a series of zeros. For example, IPv6 address ff06:0:0:0:0:0:0:c3 can be written as ff06::c3. Double colons can be used only once in an IP address.

2024-07-04

Vim Keybinding

-dG: deletes from the cursor till the last line of file

2024-07-07

git

git stash: recording the state of working directory with changes to the working directory,but want to go back to the clean working directory, this saves local changes and reverts the working directory to the HEAD.

For example your present working directory is branch1 and made a few local changes and these local changes has to be in another new branch, branch2

git stash: stash the local changes
git stash branch branchName: creates a new branch with the branch name as <branchName> and the local changes which were stashed are moved to the new branch.
git stash pop: to pop out the stashed changes in the new branch created.

git notes: is a feature to add extra information to a commit without the need to changing the commit itself.

adding git notes feature to latest commit

$ git notes add -m "testing notes feature for the latest commit"

$ git log
commit e2d42c8b5104bb71b2697e723e23eb161684fbe4 (HEAD -> master, origin/master, origin/HEAD)
Author: Vinay Keshava <vinaykeshava@email.com>
Date:   Wed Jul 3 17:54:57 2024 +0530

    wily:July 3rd

Notes:
    testing notes feature for the latest commit

git notes add -m "<message>": adding notes to the lastest commit
git notes add -m "<message>" <commit-id>": adding a note to a particular commit
git notes append -m "<message>" <commit-id>: appending a note to existing commit
git notes remove <commit-id>: removing notes for a particular id.

Vim Learnings

CTRL-G: displays the file postion and other details.
gg: moves the cursor to the top of the file.
G: moves the cursor to bottom of the file.

Substitute command

s/<oldphrase>/<newphrase>: replaces the single occurence of old phrase with the new phrase.
s/<oldphrase>/<newphrase>/g : to find and replace every occurennce.
s/<oldphrase>/<newphrase>/gc : to find and replace every occurennce of the phrase with a prompt to be replaced or not.

/bin/bash

BASH stands for ‘Bourne Again SHell’, shell programming uses other common shells like sh,csh etc. Shell programming can be achieved by directly executing commands at the shell prompt.

Shebang: #!/bin/bash telling the operating system which interpreter to be used to parse the rest of the file.

Ansible

Ansible is a open source tool, that automates application deployment, cloud provisioning, intra-service orchestration.

2024-07-08

Vim Learnings

Executing commands using :!<command-name> - used to execute the command for example !ls will list the files in the current working directory and press ENTER to continue.

Writing to New files

Writing more files, copying the same contents of the existing file to another file using :w <new-file-name>, say for example working on the file hellohello.txt and you execute the command :w hello1.txt will copy the same contents onto another new file called hello1.txt.
Copying the selected content onto a new file: Enter visual mode by pressing v, and in the below prompt :'<,'> and then follow the above similar step to save the copied contents onto new file. :'<,'> w hello1.txt, the new file hello1.txt is created with the selected content.

2024-07-25

zsh and fzf configuration

for autosuggestion and syntax highlighting install the packages zsh-autosuggestion and zsh-syntax-highlighting
wrote a blog post here for configuring fzf with zsh-fzf

2024-07-26

caddy webserver configuration

Serving a static files like hugo from caddy webserver, with the below example

static file

https://domain1.in, https://www.domain1.in {
	root * /var/www/html/domain1
	file_server
}

where /var/www/html/domain1 is the location of the static files.

To serve a reverse_proxy for an application running in localhost on port 8085.

reverse proxy

https://domain-name.tld {
	reverse_proxy localhost:8085
}

2024-07-27

Self hosted thelounge irc server using docker and set up the proxy in Caddyfile

2024-07-29

Writing a .bat file in windows, starting a particular .exe file start %SOME_PATH_OF_THE_EXE%\file.exe
Setting a path to a variable in .bat file

SET JAVA_HOME="C:\ProgramFiles..
SET JDK=%JAVA_HOME%\bin

2024-07-30

i3 config - to remove the top border in i3wm

.config/i3/config

default border pixel 0

connecting irc oftc network in thelounge, click on add network and then irc.oftc.net with port 6697

2024-07-31

lazy vim configuration clone the lazy vim git repository and move it to the configuration folder of neovim and that’s it start using it.
copying text to clipboard in neovim, use visual mode and copy the selected text and type "+y and press enter.

2024-07-31

lazy vim configuration clone the lazy vim git repository and move it to the configuration folder of neovim and that’s it start using it.
copying text to clipboard in neovim, use visual mode and copy the selected text and type "+y and press enter.

04, April 2024 08, Aug 2024