Issue command:
Code:
tar xf packagename.tar
This will produce a folder/directory by the package's name, there will be a README file or INSTALL file with further instructions.
If it is a .tar.gz package, issue command:
Code:
tar xzf packagename.tar.gz
If it's a .tar.bz2 package, issue command:
Code:
tar jxf packagename.tar.bz2
To view the README.txt, issue command:
Then use the up/down arrow keys to scroll up and down the document.
EDIT: Replace "packagename" with actual name of the package.