学步园

#!/bin/bash

PS3='Choose your favorite vegetable: ' # Sets the prompt string.
                                       # Otherwise it defaults to #? .

echo

select vegetable in "beans" "carrots" "potatoes" "onions" "rutabagas"
do
  echo
  echo "Your favorite veggie is $vegetable."
  echo "Yuck!"
  echo
  break  # What happens if there is no 'break' here?   一直循环执行
done

exit

# Exercise:
# --------
#  Fix this script to accept user input not specified in
#+ the "select" statement.
#  For example, if the user inputs "peas,"
#+ the script would respond "Sorry. That is not on the menu."

[root@localhost shell]# ./ex31.sh

1) beans
2) carrots
3) potatoes
4) onions
5) rutabagas
Choose your favorite vegetable: 2

Your favorite veggie is carrots.
carrots

Yuck!

#!/bin/bash

PS3='Choose your favorite vegetable: '

echo

choice_of()
{
select vegetable
# [in list] omitted, so 'select' uses arguments passed to function.
do
  echo
  echo "Your favorite veggie is $vegetable."
  echo "Yuck!"
  echo
  break
done
}

choice_of beans rice carrots radishes tomatoes spinach
#         $1    $2   $3      $4       $5       $6
#         passed to choice_of() function

exit 0

[root@localhost shell]# ./ex32.sh beans rice carrots radishes tomatoes spinach

1) beans
2) rice
3) carrots
4) radishes
5) tomatoes
6) spinach
Choose your favorite vegetable: 4

Your favorite veggie is radishes.
Yuck!