SED Cheatsheet

# Remove content of file
sudo sed -i '/.*/d' /var/log/daily.out.log

# Remove first charachter every lines

sed 's/^.//' -i drupal-urls

grep -nr "cpassword" 

# Extract substring between quotation "cpassword="

grep -oP 'cpassword=[0-9A-Za-z=+\/"]+' 

# Extract substring between quotation ""

grep -oP '(["])(?:(?=(\\?))\2.)*?\1'