Re: Command Line option misunderstanding - Mailing list pgsql-novice
| From | David G. Johnston |
|---|---|
| Subject | Re: Command Line option misunderstanding |
| Date | |
| Msg-id | CAKFQuwaNdRVNgKi014CGykDin43gsaSDgX+TKucbNsa-ZD1aEw@mail.gmail.com Whole thread Raw |
| In response to | Command Line option misunderstanding (punch-hassle-guise@duck.com) |
| List | pgsql-novice |
On Mon, Dec 2, 2024 at 11:47 AM <punch-hassle-guise@duck.com> wrote:
----attempt 1--
psql -h anna -d GT7 -v v1=12 -c 'select :v1'
ERROR: syntax error at or near ":"
LINE 1: select :v1
The variable got assigned correctly but it isn't in scope here due to the how -c is implemented, as the others noted.
----end attempt---
---attempt 2 ---
psql -h anna -d GT7 -vv1=1 -c 'select ":v1" '
ERROR: column ":v1" does not exist
LINE 1: select ":v1"
You double-quoted the whole thing so it's taken as a column name. Has no relevance to the problem at hand.
---end attempt ---
--- atttempt 3----
psql -h anna -d GT7 -vv1=1 -c 'select :v1'
ERROR: syntax error at or near ":"
LINE 1: select :v1
Redundant with 1
---end attempt
---attempt 4----
sql -h anna -d GT7 -v "v1=1" -c "select :v1"
ERROR: syntax error at or near ":"
LINE 1: select ":v1"
Redundant with 1 and 3, putting quotes around the shell option value only makes explicit what is implicit/optional. This is also a shell usage education issue, not psql specific.
--- end attempt---
---attempt 5 ---
psql -h anna -d GT7 -v 'v1=1' -c 'select ":v1" '
ERROR: column ":v1" does not exist
LINE 1: select ":v1"
Redundant with 2
----end attempt
--- attempt 6---
psql -h anna -d GT7 -v :v1=1 -c 'select ":v1" '
psql: error: invalid variable name: ":v1"
Shell command failed since you cannot name a variable with a leading colon, otherwise the chosen syntax for referencing a variable would be challenging
---end attempt
--- attempt 7 ---
psql -h anna -d GT7 -v "v1"=1 -c 'select ":v1" '
ERROR: column ":v1" does not exist
LINE 1: select ":v1"
Another redundant attempt using double-quotes
--- end attempt
---attempt 8 ---
psql -h anna -d GT7 -v 'v1'=1 -c 'select ":v1" '
ERROR: column ":v1" does not exist
LINE 1: select ":v1"
And again...
--- end attempt ---
---attempt 9 ---
psql -h anna -d GT7 -c '\set v1 12; select ":v1" '
... Not realizing how -c and meta-commands interplay (or don't in this case) really led you to try lots of stuff that cannot work but is unrelated to setting a variable.
--- end attempt ----
Skipping 10-17 as redundant variations on not reading how -c works.
---attempt 18---
psql -h anna -d GT7 -v --set v1=12 -c 'select :v1 '
Password for user v1=12:
You can get odd errors when you don't following the syntax diagrams and shell command writing rules...
---end attempt---
---attempt 19 ---
kdibble@thinkstation:~/development/gt7-scraper$ psql -h anna -d GT7
--set v1=12 -c 'select :v1 '
ERROR: syntax error at or near ":"
LINE 1: select :v1
Back to redundant with 1...
---end attempt
--- attempt 20---
psql -h anna -d GT7 -v --set v1=12 -c 'select :v1 '
Password for user v1=12:
Again, not following syntax rules.
--end attempt---
---attempt 21 ---
psql -h anna -d GT7 -v v1 --set v1=12 -c 'select :v1 '
ERROR: syntax error at or near ":"
LINE 1: select :v1
And back to redundant with 1 after figuring out syntax rules for -v/--set
---end attempt
---attempt 22 ---
psql -h anna -d GT7 -v v1 --set =12 -c 'select :v1 '
psql: error: invalid variable name: ""
And now invalid shell syntax form for the set command.
---end attempt---
---attempt 23---
psql -h anna -d GT7 -v v1 --set 12 -c 'select :v1 '
ERROR: syntax error at or near ":"
LINE 1: select :v1
Redundant with 1 again...
---end attempt
---attempt 24 ---
psql -h anna -d GT7 -v v1 --set v1=12 -c 'select :v1 '
ERROR: syntax error at or near ":"
LINE 1: select :v1
And again...
---end attempt---
---attempt 25---
psql -h anna -d GT7 -v --set v1=12 -c 'select :v1 '
Password for user v1=12:
Random stuff when inventing syntax again
----
---attempt 26 ---
psql -h anna -d GT7 --set v1=12 -c 'select :v1 '
ERROR: syntax error at or near ":"
LINE 1: select :v1
Redundant with 1 again...
---end attempt
---attempt 27---
psql -h anna -d GT7 -v v1="3" -c "select :v1"
+ psql -h anna -d GT7 -v v1=3 -c 'select :v1'
ERROR: syntax error at or near ":"
LINE 1: select :v1
Redundant with 1 again...
---end attempt
---attempt 28---
psql -h anna -d GT7 -v v1='3' -c "select :v1"
ERROR: syntax error at or near ":"
LINE 1: select :v1
Redundant with again
--- end attempt ---
---attempt 29---
psql -h anna -d GT7 -c '\set v1 12; select :v1 '
Didn't read how -c works
---end attempt ---
---attempt 30 ---
psql -h anna -d GT7 -v --set v1:=12 -c 'select :v1 '
Password for user v1:=12:
Don't understand shell syntax for -v versus --set (repeat)
---end attempt ---
---attempt 31 ---
psql -h anna -d GT7 --variable=v1=12 -c 'select :v1 '
ERROR: syntax error at or near ":"
LINE 1: select :v1
Redundant with 1 again
---end attempt---
---attempt 32---
psql -h anna -d GT7 --variable="v1=12" -c 'select :v1 '
ERROR: syntax error at or near ":"
LINE 1: select :v1
Redundant with 1 again.
---end attempt---
If short, you figured out a bunch of ways to write valid and invalid variable specifications. The invalid ones give you various different errors. The correct ones all give you the same error since you cannot use a variable along with -c, which is documented in -c, not variables, since they get set just fine.
David J.
pgsql-novice by date: