in the idiom
for i in $directories; do
# ...
done
... is the variable $i local or global?
And what if there happens to be a global variable of the same name. Does bash work with the global variable or the one of the for ... in ... header ?
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1 Answer
for doesn’t introduce its own variable scope, so i is whatever it is on entry to the for loop. This could be global, or local to whatever function declared it as local, or even global but in a sub-shell.
On exit from the for loop, the variable will have the last value it had in the loop, unless it ended up in a sub-shell. How much that affects depends on the variable’s scope, so it is a good idea to declare loop variables as local inside functions (unless the side-effect is desired).
