- cache -- Cache parameter files, or print the current cache list
- calacs -- Process ACS images through all the steps of the ACS Pipeline calibration.
- calc_bary -- calculate the barycenter time corrections
- calc_factors -- add bright Earth & deep survey factors to BKFAC table
- calcband -- Calculate a model passband.
- calcomp -- Plot metacode on a Calcomp pen plotter
- calcphot -- Calculate photometric quantities for spectra and passbands.
- calcspec -- Calculate a model spectrum.
- calfoc -- Pipeline calibration code for FOC data.
- calfos -- Pipeline calibration for FOS.
- calhrs -- Pipeline calibration for HRS.
- calhsp -- Perform pipeline calibration correction of HSP data files.
- calibrate -- Apply extinction and flux calibrations to spectra
- calnica -- Pipeline calibration for single NICMOS images.
- calnicb -- Pipeline calibration for NICMOS associations.
- calpolar -- Perform polarimetry processing of calibrated data.
- calstis -- Process STIS images (imaging and spectrum) through the different steps of the STIS Pipeline calibration.
- calwfp -- Run the WF/PC calibration code on an input image.
- calwp2 -- Routine calibration of HST Wide Field Planetary Camera-II images.
- carith -- Multiply or divide complex images.
- carrousel -- Calibrate HRS carrousel position.
- cat2exp -- create exposure map from constant aspect table
- cat_make -- create constant aspect table from QPOE file
- catalogs -- Describe the astrometric catalog configuation file
- catfits -- Produce a catalog of FITS files on tape or on disk
- cathodemap -- Compute the granularity of the HRS photocathode.
- catlim -- Specify star catalog limits (pset for 'skymap').
- ccdgeometry -- Discussion of CCD coordinate/geometry keywords
- ccdgroups -- Group CCD images into image lists
- ccdhedit -- Mosaic header editor
- ccdinstrument -- Review and edit instrument translation files
- ccdlist -- List mosaic processing information
- ccdmask -- Create bad pixel mask from CCD flat field images
- ccdproc -- Process mosaic exposures
- ccdtime -- CCD photometry exposure time calculator
- ccdtypes -- Description of the CCD image types
- ccfind -- Find catalog sources in an image
- ccget -- Extract objects from a text file catalog
- ccmap -- Compute image plate solutions using matched coordinate lists
- ccsetwcs -- Create an image celestial wcs from the ccmap plate solution
- ccstd -- Transform to and from standard astrometric coordinates
- ccsystems -- Describe the supported celestial coordinate systems
- cctran -- Transform coordinate lists using the ccmap plate solution
- ccxymatch -- Match celestial and pixel coordinate lists
- cd -- Change directory
- cdriz -- Pset for the 'offsets' task.
- cellmap -- block a qpoe file at detect cell size resolution
- censor -- Information about the censoring indicator in survival analysis.
- center -- Compute accurate centers for a list of objects
- centerflux -- Compute the flux values for the center of a diode array.
- centerpars -- Edit the centering parameters
- cgausspars -- Pset with parameters for constrained Gaussians function.
- cgiparse -- Parse STRING_QUERY environment variable into task parameters
- chcalpar -- Modify calibration keyword values.
- chdir -- Change directory
- checkwfpc -- Perform consistency checks on a WF/PC reference file.
- chgkeywrd -- Change keywords in a header file.
- chiplot -- plot a chi-square table (output of period)
- chkconfig -- Check the configuration file for grammar and syntax errors
- chpixtype -- Change the pixel type of a list of images
- ckwfoc -- FOC calibration parameters (pset).
- ckwfos -- FOS calibration parameters (pset).
- ckwhrs -- HRS calibration parameters (pset).
- ckwhsp -- HSP calibration parameters (pset).
- ckwnicmos -- NICMOS calibration parameters (pset).
- ckwstis1 -- STIS CCD Imaging calibration parameters (pset).
- ckwstis2 -- STIS CCD Spectroscopic calibration parameters (pset).
- ckwstis3 -- STIS MAMA Imaging calibration parameters (pset).
- ckwstis4 -- STIS MAMA Spectroscopic calibration parameters (pset).
- ckwwfp2 -- WFPC-2 calibration parameters (pset).
- ckwwfpc -- WFPC calibration parameters (pset).
- cl -- Execute commands from the standard input
- clbye -- A cl followed by a bye (used to save file descriptors)
- clear -- Clear the terminal screen
- coadd -- Calculate average measurements in specified phase intervals.
- coefs -- Extract mtn reduced ceofficients from henear scans
- coincor -- Correct spectra for detector count rates
- colbias -- Fit and subtract an average column bias
- colnames -- Specify star catalog column names (pset for 'skymap').
- columns -- Convert multicolumn file to separate files
- combine -- Combine mosaic exposures
- commands -- A discussion of the syntax of IRAF commands
- comparesets -- Compare spectra at different waveplate positions.
- compass -- Draw north and east arrows.
- comppars -- Pset with parameters for composite (bb + powerlaw) function.
- compspec -- Create a spectrum from an algebraic expression.
- concatenate -- Concatenate a list of files
- config -- Print description of the configuration file format
- continpars -- Edit continuum subtraction parameters
- continuum -- Fit the continuum in spectra
- contour -- Make a contour plot of an image
- contpars -- Set parameters for continuum removal
- controlpar -- Set algorithm control parameters (pset).
- controlpars -- Pset with algorithm control parameters.
- contsum -- Set continuum removal parameters for template making
- convert -- Convert ASCII data base format to STSDAS table format.
- convolve -- Convolve a list of 1 or 2-D images with a rectangular filter
- coords -- description of IRAF coordinates used in PROS
- copy -- Copy a file or files (use IMCOPY for imagefiles)
- copyftt -- Copy a list of FITS tables to a local directory with correct extensions
- copymask -- Copy mask from one format into another.
- cosmicrays -- Remove cosmic rays using flux ratio algorithm
- count -- Count the number of lines, words, characters in a text file
- countfiles -- Count how many files are in the input file template.
- countrate -- Evaluate the photometric count rate of the HST.
- counts_plot -- Plot the observed and/or predicted counts distributions.
- countspec -- Calculate FOS countrate spectrum from flux spectrum.
- coxhazard -- Compute the correlation probability by Cox's proportional hazard model.
- craverage -- Detect CRs against average and avoid objects
- crcombine -- Combine multiple exposures to eliminate cosmic rays
- credit -- Interactively edit cosmic rays using an image display
- crfix -- Fix cosmic rays in images using cosmic ray masks
- crgrow -- Grow cosmic rays in cosmic ray masks
- crmedian -- Detect and replace cosmic rays with median filter
- crnebula -- Detect and replace cosmic rays in nebular data
- crosscor -- Cross-correlate two images.
- crossdriz -- Builds a set of cross-correlation images (shift + rotation).
- crrej -- Combine images to make a cosmic ray free image.
- crtpict -- Generate greyscale plots of IRAF images
- curfit -- Fit data with Chebyshev, Legendre or spline curve
- cursors -- Graphics and image display cursors
- cv -- Control image device, display "snapshot"
- cvl -- Load image display (newer version of 'display')