### SHOWSET

#### Description:

This routine is used to examine the Set membership attributes of images. It will show the Set Name and Set Index attributes for each image, and whether it contains a CCD_SET coordinate frame in its WCS component. The images are output grouped by Set Name or Set Index. If required, a restricted list of images, those with certain Name and/or Index attributes, may be selected for output; in this case the acceptable Names/Indexes can be given explicitly or as a list of template images whose attributes they have to match. The names of the images selected for output may be written to a list file. SHOWSET can therefore be used to construct files listing those images in a given Set, or corresponding images in different Sets.

showset in

#### Parameters:

A list of images to examine.
If PICKINDEX=EQUAL this parameter restricts which files will be selected for output. It must be a group expression (a comma-separated list) each member of which is an acceptable INDEX value. Only files with a Set Index value equal to one of these will be selected.
If PICKINDEX=LIKE this parameter restricts which files will be selected for output. It must be a group expression (a comma-separated list which may employ wildcards or indirection) each member of which represents an image to be used as a template. Only images with a Set Index value matching that of one of the template images will be selected.
Indicates the way in which images should be grouped for output. It may take the values ’NAME’, ’INDEX’ or ’NONE’. If set to NAME, then all the images in the same Set are grouped together in the output; if set to INDEX then all the corresponding images from different Sets are grouped together, and if set to NONE images will be listed in the same order as the IN parameter. If only images with the same Name or with the same Index are being output, this will have no effect. [NAME]
Name of the CCDPACK logfile. If a null (!) value is given for this parameter then no logfile will be written, regardless of the value of the LOGTO parameter.

If the logging system has been initialised using CCDSETUP then the value specified there will be used. Otherwise, the default is "CCDPACK.LOG". [CCDPACK.LOG]

Every CCDPACK application has the ability to log its output for future reference as well as for display on the terminal. This parameter controls this process, and may be set to any unique abbreviation of the following:
• TERMINAL – Send output to the terminal only

• LOGFILE – Send output to the logfile only (see the LOGFILE parameter)

• BOTH – Send output to both the terminal and the logfile

• NEITHER – Produce no output at all

If the logging system has been initialised using CCDSETUP then the value specified there will be used. Otherwise, the default is "BOTH". [BOTH]

If PICKNAME=EQUAL this parameter restricts which files will be selected for output. It must be a group expression (a comma-separated list) each member of which is a string. Only files with a Set Name value the same as one of these will be selected.
If PICKNAME=LIKE this parameter restricts which files will be selected for output. It must be a group expression (a comma-separated list which may employ wildcards or indirection) each member of which represents an image to be used as a template. Only images with a Set Name value matching that of one of the template images will be selected.
The name of an output file in which to write the names of the images selected for output. The (non-comment) lines of this file are of the form:

image-name # set-index set-name

since the set-index and set-name values appear to the right of a comment character, the file can thus be used as an indirection file for input to other CCDPACK commands. [showset.lis]

Indicates how images are to be filtered by Set Index attribute for output. Takes one of the following values:
• ALL – All Index values are acceptable

• EQUAL – Only Index values listed in the INDEX parameter value are acceptable

• LIKE – Only Index values the same as those of the images listed in the INDEXLIKE parameter are acceptable.

[ALL]

Indicates how images are to be filtered by Set Name attribute for output. Takes one of the following values:
• ALL – All Name values are acceptable

• EQUAL – Only Name values listed in the NAME parameter value are acceptable

• LIKE – Only Name values the same as those of the images listed in the NAMELIKE parameter are acceptable.

[ALL]

If there are no restrictions on which Sets to display, because PICKNAME and PICKINDEX are both set to ALL, this parameter determines what happens to images which have no Set headers. If SETLESS is true, they are selected for output, but if SETLESS is false, they are discarded. [FALSE]

#### Examples:

showset $\ast$
This will list all the images in the current directory which contain Set header information; the listing will be grouped by the Set Name attribute and Set Index will be shown.
showset $\ast$ setless=true
This will do the same as the previous example, except that those images with no Set header information will be displayed as well.
showset $\ast$ pickname=like namelike="gc6235a,gc4021a" namelist=gc.lis
This will list all the images in the current directory which are in the same Set as the images gc6235a and gc4021a. As well as showing the Set information of these files on the screen, the names of the files thus selected will be written to the file gc.lis.
showset fdata setless reset
This will just show the Name and Set information of the file fdata. If fdata is a container file, it will show the Set information for all the datasets within it. Since the SETLESS parameter is given, even if it has no Set header output will be written.
showset dat$\ast$ pickindex=equal index=3 logto=neither namelist=out.lis
This will write a list of image names to the file out.lis choosing only those which have a Set Index attribute value of 3. There will be no output to the screen or log file.

All parameters retain their current value as default. The "current" value is the value assigned on the last run of the application. If the application has not been run then the "intrinsic" defaults, as shown in the parameter help, apply.