I need to make a select menu that gives options dynamically based on whether certain files are available. For instance:
PS3="Open which readme? "
select readme in This That
do
case "$readme" in
This) open -a /Applications/TextEdit.app This.txt;;
That) open -a /Applications/TextEdit.app That.txt;;
* ) echo "Invalid selection";;
esac
done
}
The catch is that if the file doesn't exist, it should not show in the menu, either. I'm fairly new to shell scripting, so any help would be appreciated.
Thanks for the example. I follow the logic for making a list of existing files, but it's the case statement that is confusing me. I'm not sure what to put in the 'options' section (talk about irony - that's where you stopped). This is the output (no options selectable):
1) This.txt
2) That.txt
#?
If I select either option, it returns Invalid Selection.
Here's the code I used:
Code:
i=0
for item in This.txt TheOther.txt That.txt
do
if [ -r $item ]; then
existing[i]=$item
let i++
fi
done
select readme in "${existing[@]}"
do
case "$readme" in
$existing[1]) echo "This.txt";;
$existing[2]) echo "Red Herring";;
$existing[3]) echo "That.txt";;
* ) echo "Invalid Selection";;
esac
done
i=0
for item in This.txt TheOther.txt That.txt
do
if [ -r $item ]; then
existing[i]=$item
let i++
fi
done
select readme in "${existing[@]}"
do
case "$readme" in
This.txt) echo "This.txt";;
TheOther.txt) echo "Red Herring";;
That.txt) echo "That.txt";;
* ) echo "Invalid Selection";;
esac
done
So I would put one entry in the case statement for each item in the "for" loop. I don't see any value in using the array syntax.
Google's right in that you need to use the braces. But an additional problem is that the array is zero based. The first subscript should be zero, not one.
But switching to correct subscripts still leaves a problem. ${existing[0]} will be This.txt only if This.txt exists. That was the point of the test. If This.txt does not exist and TheOther.txt does exist, ${existing[0]} will be TheOther.txt. This is why I would go with just constants in the case statement.
You don't really need to complicate things by using loops and arrays...
Code:
PS3="Open which readme? "
select readme in $(ls This.txt That.txt 2> /dev/null)
do
case "$readme" in
*.txt) echo open -a /Applications/TextEdit.app "$readme"; break;;
*) echo "Invalid selection";;
esac
done
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