alias (Skyview)		- create a nickname for a set of commands or coordinates
annotate (Skyview)	- annotate the screen with text remarks
background (Skyview)	- determine a background level to subtract when examining areas
border (Skyview)	- re-size the window properly, and place a blank frame of pixels around the image.
bye (Skyview)		- exit the skyview program
change_area (Skyview)	- change back and forth between previously defined areas
change_dir (Skyview)	- change working directory
clip (Skyview)		- omit a section of an image's pixels from the view of the window
color_table (Skyview)	- Select a particular color lookup table for image display
contour (Skyview)	- create a contour plot of an image, either overlaying it on the  displayed image, producing a hardcopy, or in a Tektronix window.
crop (Skyview)		- Create a new file that contains a piece of the current image.
current_image (Skyview) - select an image to work on 
define_area (Skyview)	- outline a geometric shape on an image which defines a region	of interest for examination
delete_file (Skyview)	- delete a file off the disk
directory (Skyview)	- list the names of the files within a directory
erase (Skyview)		- Remove images and/or graphics from the screen
examine (Skyview)	- investigate a defined area and report statistics
exit (Skyview)		- exit the skyview program
file (Skyview)		- select an image file for use with skyview
find_plate (Skyview)	- Decide which IRAS Skyflux or ISSA plate contains a given coordinate
flatten (Skyview)	- flatten an image by removing a least-squares fit plane
frame (Skyview)		- Select or report the window number for subsequent skyview commands to use
graphics_examine (Skyview)  - refer back to table or catalog data for information on each point marked on an image from tables within a defined area.
graphics_pick (Skyview) - refer back to the table or catalog data for information on points from the table that have been marked on an image
grid (Skyview)		- display a coordinate grid in the same window over a displayed image.
header (Skyview)	- show the header information pertaining to an image file
help (Skyview)		- Show the complete help information for a given skyview function
histogram (Skyview)	- display a histogram of the DN values for the current image file in a window on the screen.
histogram_original (Skyview)	- display a histogram of the original image data, in units from the file, before the transfer to DN (screen) units
magnifier (Skyview)	- display a magnifier window on the screen to show a close-up view  of the displayed images as the mouse roams.
map (Skyview)		- Select one 8-bit plane (on 24-bit systems only) for image display
mark (Skyview)		- place a marker of a certain color, size and shape at a particular point on an image
mode (Skyview)		- description
off (Skyview)		- Turn off image or overlay planes
on (Skyview)		- Turn on image or overlay planes that were previously turned off
paint (Skyview)		- display an image in a window on the screen
pause (Skyview)		- suspend execution of skyview until hitting the <Return> key
pick (Skyview)		-  select a point on an image for inspection
plane (Skyview)		- depth index for use in 3 dimensional	data cubes
print_history (Skyview) - print out the file that contains the session history log
print_working_dir (Skyview) - display the pathname of the current working directory
quit (Skyview)		- Get out of the skyview program
range (Skyview)		- set the range of data values in an image to be used for display in  DN (0-255)
replicate (Skyview)	- replicate pixels in an image
rewind (Skyview)	- re-position the tape back to the beginning
scatter_plot (Skyview)	-  produce a scatter plot of the values in an area defined on an image vs. the same area in another image
screen_dump (Skyview)	- dump a displayed image to disk, creating an 8-bit FITS image
set (Skyview)		- Assign values to certain environmental parameters
set_history_file (Skyview)  - turn the logging of the session history on and off
skybox (Skyview)	- collect sky statistics
skyview (l)		- interactive image display and analysis tool for astronomical data
sleep (Skyview)		- suspend execution of skyview for a number of seconds
slice (Skyview)		- slice across an image with a vector and plot the pixel values
stretch (Skyview)	- adjust the color table values of pixels in a displayed image.
table (Skyview)		- execute a skyview command using input from a table file for parameter(s)
take (Skyview)		- execute a group of skyview commands from within a file instead  of from the command line
tape_read (Skyview)	- read FITS files in from tape or disk 
tape_write (Skyview)	- read FITS files in from tape or disk 
wedge (Skyview)		- Display a ramp function showing the color table stretch in a separate window on the screen
write (Skyview)		- Write an image with zapped pixels out to a new image file
zap (Skyview)		- Edit pixels in an image to give them new values
zoom_pan (Skyview)	- zoom in or out on an image, and pan around
