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'.