How does systemctl variable escaping work in a shell?

Question

I want do a batch job with systemctl, something like:

systemctl status v2ray-haproxy@{1..5}

That's fine. But when i change 5 to a variable：

n=5;systemctl status v2ray-haproxy@{1..$n}

It's not working now, and error:

Invalid unit name "v2ray-haproxy@{1..5}" was escaped as "v2ray-haproxy@\x7b1..5\x7d" (maybe you should use systemd-escape?) Unit v2ray-haproxy@\x7b1..5\x7d.service could not be found.

How to get this variable code work?

Answer 1

try something like below

n=5;systemctl status v2ray-haproxy@{1..$(seq 1 $n)}