You can ignore your ~/.psqlrc when running psql commands by using the -X or --no-psqlrc flags.
So when you have all this in your rc file:
/* ~/.psqlrc */
\x auto
\timing
\set PROMPT1 '%[%033[1m%]%M %n@%/%R%[%033[0m%]%# '
\set PROMPT2 '[more] %R > '
\pset null '☢'
\setenv PSQL_PAGER pspg
\setenv PAGER pspg
This command becomes quite noisy:
psql -c 'select 1'
Expanded display is used automatically.
Timing is on.
Null display is "☢".
Time: 0.210 ms
?column?
----------
1
(1 row)
Time: 0.297 ms
If you run without the config file:
psql -X -c 'select 1'
?column?
----------
1
(1 row)
on-line manual pages:
-X,
--no-psqlrc
Do not read the start-up file (neither the system-wide psqlrc file nor the
user's ~/.psqlrc file).