Run script in background using `&` or `()&`?

Asked Jun 08 '19 at 05:42

Active Jun 08 '19 at 05:42

Viewed 259 times

If I want to run a script in background, for example a.sh, should I run

./a.sh &

or should I put it in a subshell then background it?

(./a.sh) &

I test both and don't see difference, both works, can anyone tell me when should I use ()& or just &? what's the real difference and cautious?

asked Jun 08 '19 at 05:42

chengdol

Possible duplicate of: putting subshell in background vs putting command in background – ozzy Jun 08 '19 at 07:22
1

You should use the 1st. The 2nd just gives the spurious impression that it's doing something special, while in fact it isn't. Do not confuse it with (./a.sh &) which really is different. – Jun 08 '19 at 08:20

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