How to replace string in the project using terminal in Ubuntu?

We want to replace the string "regexp" with the string "replacement" in the terminal.
Let's say our project path is /home/www/project_name.
Actually regexp string is a regular expression pattern for our string.

This command works right:
cd /home/www/project_name
find . -type f -print0 | xargs -0 sed -i 's/regexp/replacement/g' Let's see what the command means.
I will translate it to the normal language for human beings.

Go to my project folder:
cd /home/www/project_name Find all files (-type f) in my project folder:
find . -type f Use \0 delimiter (and not whitespace) to separate between the found pathnames in the output.
(We don't want whitespaces, because filenames can contain whitespaces and we will not be able to separate between pathnames).
-print0 This is a pipe. It means all the output that we have got before this sign "|" becomes an input for a next command (xargs in our case).
| xargs takes the output (pathnames that the command find found).
We use -0 because pathnames are terminated by \0 (instead of by whitespace). We know because we specified (find -print0).
xargs -0 sed - stream editor for filtering and transforming text.
-i allows to edit files in place.
-g replace all matches, not just the first match.
Replace our "regexp" with "replacement". sed -i 's/regexp/replacement/g'

Some useful BASH shell hot keys and useful tips.

Check out these hot keys. They can help a lot to save your time.
Since I started using them, I'm just a new man :)

This one is so important, that I'll write it separately.

Ctrl+R	To search in previous commands. It displays the last occurrence.
Ctrl+R+R	It displays the occurrence before the last.

These commands are also very useful. When I say they are "useful", I really mean that I use them! :)

Ctrl+K	To delete the characters from the cursor to the end of the line.
ESC+D	To delete the characters from the cursor position to the end of the word
Ctrl+A	To move the cursor to the beginning of the command line
Ctrl+E	To move the cursor to the end of the command
Ctrl+L	To clear the screen, puts the current command line at the top of the screen

And I've got one additional tip for you. Use aliases!
Don't be lazy. It's so worth it!
To create your own alias, edit the file ~/.bashrc. Put there your alias.
Here is my alias that I use very frequently:

 alias pr='cd /var/www/myprojects' 

In this file you can see already added aliases. To check them out, you can also use alias command.

Some basic UNIX commands

Today I will write down some basic UNIX commands.
"cd -" will switch you to the previous directory.

testuser@test:~/Downloads$ cd ../Desktop/
testuser@test:~/Desktop$ cd -
/home/testuser/Downloads
testuser@test:~/Downloads$ 

"cd ~" or "cd" will switch you to your home directory.

testuser@test:~/Downloads$ cd ../Desktop/
testuser@test:~/Desktop$ cd -
/home/testuser/Downloads
testuser@test:~/Downloads$ 

"pwd" (print working directory) is used to output the path of the current working directory.

testuser@test:~/Desktop$ pwd
/home/testuser/Desktop

How to find files in a directory hierarchy that contain a string in Ubuntu

find . | grep 'string'

Search for files that contain string "string".

How to get the url of the current repository

git config --get remote.origin.url