Most of the data reduction functions of GCX are available from the command line. The program's command-line options are listed below. The same text can be obtained using gcx -help.
fscan_params: unknown name shape under node 9 gcx version 0.8.4 usage: gcx [options] [<fits file> ...] General options: -h, --help Print command line options --help-all Print all the on-line help on stdout --version Print program version -D, --debug <level> Set debug level to <level>; 0=quiet, 4=noisy -o, --output <file_name> Specify output file name for import, convert and frame operations -r, --rcfile <params_file> Load parameters file -S, --set <option>=<value> Set an option overriding the parameters file -i, --interactive Display frames as they are being processed Observation scripting, photometry and file conversion options: -p, --recipe <recipe_file> Load recipe file (searches rcp_path) -P, --phot-run <recipe_file> Load recipe file and run photometry in batch mode. Report in native format. -V, --phot-run-aavso <recipe_file> Load recipe file and run photometry in batch mode. Report in AAVSO format. --import <catalog name> Convert a tabular catalog file to the gcx Lisp-like format. Reads stdin. Current table formats are: gcvs, gcvs-pos, landolt, henden --merge <recipe_file> Merge a new recipe file over the one loaded with the --recipe option. Checks are made for either positional or name duplicates. Only stars brighter than mag_limit are merged. --set-target Specify a target object to be merged into a recipe file. It will also set the recipe object, ra and dec fields. --make-tycho-rcp <radius> Create a recipe file for the object specified with --object using tycho2 stars in a box radius arcminutes around the object --rcp-to-aavso <recipe_file> Conevrt a recipe file to the aavso db (tab-delimited) format If the file argument is '-', stdin is read The recipe comment and star comment fields are interpreted to get some db fields. see the --help-all for more info -T, --rep-to-table <report_file> Convert a report file to tabular format If an output file name is not specified (with the '-o' argument), stdout is used If the file argument is '-', stdin is read -O, --obsfile <obs_file> Load/run obs file (searches obs_path) -n, --to-pnm Convert a fits file to 8-bit pnm If an output file name is not specified (with the '-o' argument), stdout is used -j, --object Specify a target object (useful for setting an initial wcs --mag-limit Set a magnitude limit for the output of import and merge commands. CCD Reduction Options -d, --dark <dark_frame> Set the dark frame / do dark subtraction -b, --bias <bias_frame> Set the bias frame / do bias subtraction -f, --flat <flat_frame> Set the flat field frame / flatfield -G, --gaussian-blur <fwhm > Set blur FWHM / apply Gaussian blur -a, --align <align_ref_frame> Set the alignment reference frame / align frames -A, --add-bias <bias> Set a constant bias to add to all frames / add a bias to frames -M, --multiply <multiplier> Set a constant to multiply all frames with / multiply frames by a scalar Multiplication is performed before addition. -u, --update-file Save reduction results back to the original files -s, --stack Stack the frames using the method set in the parameters file; for some methods additive background alignment is performed -F, --superflat Stack the frames using an multiplicative background alignment procedure; the frames should be dark-substracted -N, --no-reduce Do not run the reduction operations, just load the frame list / reduction options When any of the CCD reduction options is set and the -i flag is not specified, the reduction operations are run in batch mode on all the supplied fits files. When no output file is specified or -i is set, the files are loaded into the batch processing file list, the reduction options set in the dialog, and the program starts up in gui mode