Please find attached a quick patch to prevent this particularly bad error message for running "postgres", when making the common mistake of forgetting to put the "--single" option first because you added an earlier arg (esp. datadir)
Current behavior: $ ~/pg/bin/postgres -D ~/pg/data --single 2024-06-05 18:30:40.296 GMT [22934] FATAL: --single requires a value Improved behavior: $ ~/pg/bin/postgres -D ~/pg/data --single --single must be first argument. I applied it for all the "first arg only" flags (boot, check, describe-config, and fork), as they suffer the same fate. Cheers, Greg
0001-Give-a-more-accurate-error-message-if-single-not-number-one.patch
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