> > I suggest to reuse pgbench expression engine, developed by Haas Robert:-)
> Not a bad idea (though I'm sure there are other reasonable options, too).

I checked the pgbench code - and I think it can work well - just add
logical operators and compare operators.

Don't need to create more complex language there.

> > Generating a error message with ${foo:?} is nice, but what psql need is
> just
> > a way to test whether a variable is defined or not.
> I'm not saying we should slavishly follow bash, but don't confuse what
> you need with what other people need.  bash (well, sh, really) grew
> that syntax for a reason, and it may be more than "there was this one
> guy back in the seventies who wanted it, and ...".
> --
> Robert Haas
> EnterpriseDB: http://www.enterprisedb.com
> The Enterprise PostgreSQL Company

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