Thread: BUG #17736: when psql -c is used, the $ sign is escaped

The following bug has been logged on the website:

Bug reference:      17736
Logged by:          dafoer_x
Email address:      dafoer_x@163.com
PostgreSQL version: 14.0
Operating system:   centos
Description:

[pg14@VM-219-249-centos ~]$ psql -d postgres -p 29822 -h 127.0.0.1 -c "set
lc_monetary='en_US.UTF-8'; drop table if exists t_mony; create table
t_mony(c1 bigint,c2 money); insert into t_mony values(2,'$1.00'); select *
from t_mony;"
 c1 |  c2   
----+-------
  2 | $0.00
(1 row)

postgres=# set lc_monetary='en_US.UTF-8'; drop table if exists t_mony;
create table t_mony(c1 bigint,c2 money); insert into t_mony
values(2,'$1.00'); select * from t_mony;
SET
DROP TABLE
CREATE TABLE
INSERT 0 1
 c1 |  c2   
----+-------
  2 | $1.00
(1 row)

Because $ is escaped, the results are different when the same command is
executed in psql and internally.
I would like to ask how to solve this problem, or why there is this
difference?

Regards