### 2 Starting up CCDPACK

CCDPACK commands are made available from the C shell using the command:

% ccdpack

(note that the % represents the C-shell prompt and shouldn’t be typed).

CCDPACK commands can also be used from the Starlink/ICL and IRAF/CL command languages (IRAF users should consult section §A).

#### 2.1 Getting Help

Help is available in two forms; from the command-line and via a hypertext version of this document. Just type:

% ccdhelp

to get the command-line version, and:

% ccdwww

to load the hypertext version. The hypertext version has one optional parameter, the name of the WWW browser to use. The default is the Netscape Navigator although NCSA Mosaic can also be used. If you prefer Mosaic try the command:

% ccdwww Mosaic

If this doesn’t work then replace the word Mosaic with the command that starts the browser for you (this shouldn’t be an alias). If you want to always use Mosaic then set the environment variable HTX_BROWSER to Mosaic in your .login file.

Help is also available in the reduction GUI menus or from program prompts (by responding with a ‘?’).

If you come across any bugs or problems when using CCDPACK then e-mail a description to: starlink@jiscmail.ac.uk.

#### 2.2 Running from the C-shell

When using CCDPACK from the C-shell (or any other UNIX shell) care needs to be taken with some special characters. Wildcard characters *,?,[a-z],{X,Y,Z}, quoted strings "" and vector braces [ ] must be protected by using either the escape character \ or by single quotes (wildcard characters must be protected as these are expanded internally by CCDPACK, rather than by the shell). So for instance to pass the names of several data frames and the extent of the useful part of a CCD you might use a command like:

% debias in=’"datar*,ffr?"’ extent=’[51,1094,1,1024]’

If in doubt, it is a good idea to put single quotes around arguments in this way – it can’t hurt.