how to find file via ubuntu terminal code example

Example 1: ubuntu open file from terminal

xdg-open file-name

# xdg-open myPicture.png

Example 2: ubuntu search file in specific folder

// Using backslash and asterisk (\*) at the end will search for all files that start with your search term (in this case "readme"). So you would also be able to find "readme2" etc. 
find . -name readme\*

Example 3: how to search in directory files in ubuntu

# this will search all subdirectories for your text (no case sensitivity)
# it also prints the line number of the text in file
grep -inR "your text" .

Example 4: ubuntu open file system from terminal

nautilus .
#or
nautilus /home/john/Downloads