[ILUG] Parameter expansion in the shell

[Giulivo Navigante]

Braun Brelin wrote:
> Hello all,
> 
> I'm trying to figure out what differences there are between the following:
> 
> $Foo
> 
> ${Foo}

playing with some shell scripts I discovered this some months ago:

# export VAR=val
# echo $VAR
val
# echo $VAR-X
val-X
# echo $VAR_X

# echo ${VAR}_X
val_4

which seems to be helpful when you're going to use variables and they're 
a mixed or accompained by strings

but I don't know much more
-- 
Giulio Fidente
"What we have done for ourselves alone dies with us;
  what we have done for others and the world remains."