Linux

Display "Hello"

echo "Hello" && echo 'World !'

Write a file

# nano file.txt
vim file.txt

Overwrite the file content and add a new line

echo "Erase content" > file.txt && echo "Add this" >> file.txt

Read the file content

cat -n file.txt

Search in a file

grep -n "this" file.txt

Request "ROOT" rights

sudo su

Unzip a zip

tar -zxvf tar.gz

Force deletion of a file

rm -rf document.txt

Copy a file

cp file.txt /home/user/download/file.txt

Move a file

mv file.txt /home/user/download/document.txt

Configure the keyboard in "AZERTY"

setxkbmap fr

View command history

cat .bash_history

View "NGINX" error logs

cat /var/log/nginx/error.log

See running "NGINX" processes

ps aux | grep nginx

Create a basic authentication file

sudo sh -c "echo -n 'username:' >> /etc/nginx/.htpasswd"

Add password to basic authentication file

sudo sh -c "openssl passwd -apr1 >> /etc/nginx/.htpasswd"

Get current date

date

Show formatted date

echo "$(date + '%d/%m/%Y %H:%M')"

Edit scheduled tasks

crontab -e

Run a script every day at midnight

# m h dom mon dow command
0 0 * * * /home/script.sh

File "DOS" To "UNIX"

sed -i 's/\r//'

Transfer a file via SSH

scp -r -p /path/to/file user@host:/path/to/dest

Count the number of lines in a "GIT" project

git ls-files | xargs cat | wc -l

Count the number of 'JavaScript' lines in a "GIT" project / per file

git ls-files *.js | xargs wc -l