Advanced Bash−Scripting Guide

Advanced Bash−Scripting Guide
#!/bin/bash
PS3='Choose your favorite vegetable: ' # Sets the prompt string.
echo
select vegetable in "beans" "carrots" "potatoes" "onions" "rutabagas"
do
echo
echo "Your favorite veggie is $vegetable."
echo "Yuck!"
echo
break # if no 'break' here, keeps looping forever.
done
exit 0
If in list is omitted, then select uses the list of command line arguments ($@) passed to the script
or to the function in which the select construct is embedded.
Compare this to the behavior of a
for variable [in list]
construct with the in list omitted.
Example 10−30. Creating menus using select in a function
#!/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
See also Example 35−3.
Chapter 10. Loops and Branches 123