Prevent a partially downloaded script from running.

[moretea]

By wrapping the content of the script in '{', '}', sh will not start executing any commands until the closing '}' is encountered.

---

Proof:

$ cat test1.sh
echo hello world
MISSING STUFF

$ sh test1.sh 
hello world
test1.sh: line 2: MISSING: command not found

$ cat test2.sh 
{
echo hello world
MISSING STUFF

$ sh test2.sh 
test2.sh: line 4: syntax error: unexpected end of file

[adam-sandor]

LGTM