Some commands provide help on the commands available, on the command syntax
and information on the catalogues available, these are:
The user starts the job searching if in the data base are contained
he needs. Sometimes the user don't know the name of desired catalogue, or the
name that he knows is not the one DIRA2 uses. With the DB_INFO
command he can find the names of all the catalogues that contain defined
objects (i.e. QSOs), or all the catalogues at a given band (i.e. RADIO).
Moreover he can search a specific catalogue by Author or reference or he can
search all the catalogues that contain a specific physical quantity (i.e.
Radial Velocity). When one, or many, catalogues are found, the user can
have the documentation and the description of the catalogue fields and can
understand where the data are (on tapes or on disk). DB_INFO provide the
vocabulary also, that is the table of acronimous of the catalogues fields.
- provides a list of all the DIRA2 commands with a short
explanation. Commands are sorted for types.
- provides the help of available commands.
- (PDB_INFO) Lists the catalogue available in the data base,
selects catalogues according to type and writes the documentation of the wanted
Then DB_INFO is the first command used from the beginner DIRA2 user that must
know the names of the catalogues with the wanted data. Whenever he has found
the wanted catalogue, he needs to retrieve data from.
Previous: Using DIRA
Up: Using DIRA
Next: Selection Commands
Previous Page: Using DIRA
Next Page: Selection Commands