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[doc] pg_ctl: fix wrong description for -l

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From: Kuroda, Hayato/黒田 隼人 <kuroda.hayato@fujitsu.com>
To: "'pgsql-hackers@lists.postgresql.org'" <pgsql-hackers@lists.postgresql.org>
Date: 2026-03-23T10:55:03Z
Lists: pgsql-hackers

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Hi hackers,

While investigating codes related with the permissions, I found the below
description in the pg_ctl.

```
-l filename
--log=filename
Append the server log output to filename. If the file does not exist, it is created. The umask is set to 077, so access to the log file is disallowed to other users by default.
```

But users who are in the same group can also see the log if group permissions are
enabled on the data directory. It was extended by c37b3d0 but updating the doc seemed
to be missed. Attached patch can fix the issue.

Best regards,
Hayato Kuroda
FUJITSU LIMITED

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. doc: Improve description of pg_ctl -l log file permissions