Searches the contents of the database for PRs that match the (optional)
specified expressions with the EXPR command. If no expressions were specified
with EXPR, the entire set of PRs is returned.
If one or more PRs are specified on the command line, only those PRs will be
searched and/or output.
The format of the output from the command is determined by the query format
selected with the QFMT command.
The possible responses are:
418 (CODE_INVALID_QUERY_FORMAT) A valid format was not specified with the QFMT
command prior to invoking QUER.
300 (CODE_PR_READY) One or more PRs will be output using the
requested query format. The PR text is quoted using the normal
quoting mechanisms for PRs.
220 (CODE_NO_PRS_MATCHED) No PRs met the specified criteria.