Hi,

What are the differnece between echo and printf in unix/ Linux while using in shell scripting or command line?

printf can do everything what echo can does with some basic difference.

echo is legacy and printf is recently introduce.
echo is in built in all shell but printf is built-in only in bash shell
printf also uses formatted stgrings in the same way the C language function of the same name uses them.

but
Echo - displays the output as such and it is comparatively faster than printf.