Variables, that you create (by assignment) within loop bodies, are well visible outside the loop body. This is valid for both kinds of loop.
CAVEAT:
If the “while” loop reads from a pipe, the “while” loop is executed within a subshell, i.e. the scope of the variables within the loop ends with the loop.
Example:
x=a
echo hello |
while read l
do
x=b
done
echo “x=$x”
What’s the output of this echo?
x=a
Example:
x=a
for l in hello
do
x=b
done
echo “x=$x”
What’s the output of this echo?
x=b
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