You can get input from the user using the read command. It will save the user’s response into a variable.
#!/bin/sh
echo -n "what is your favourite fish? "
read FISH
echo you like $FISH
The above example asks the user to input their favourite fish, and echoes the answer back to them.
The -n switch causes echo to omit the newline.
what is your favourite fish? tuna
you like tuna
In the above example the user has typed in ’tuna'.