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FITS(1) User Commands FITS(1) NAME Fits - view and manipulate FITS headers SYNOPSIS astfits [OPTION...] ASTRdata DESCRIPTION Fits is part of GNU Astronomy Utilities 0.24. Fits allows you to view and manipulate (add, delete, or modify) FITS extensions (or HDUs) and FITS header keywords within one extension. For more information, please run any of the following commands. In particu- lar the second contains a very comprehensive explanation of Fits's invoca- tion: expected input(s), output(s), and a full description of all the op- tions. All options and their values: $ astfits -P Inputs/Outputs and options: $ info astfits Full section in manual/book: $ info Fits Full Gnuastro manual/book: $ info gnuastro If you couldn't find your answer in the manual, you can get direct help from experienced Gnuastro users and developers. For more information, please run: $ info help-gnuastro Fits options: Input: --arguments=STR Plain-text file with command-line arguments. -h, --hdu=STR/INT Extension name or number of input data. Output: -K, --keepinputdir Keep input directory for automatic output. --outfitsnocommit No Git commit in 0-th HDU of output FITS. --outfitsnoconfig No metadata in 0-th HDU of output FITS. --outfitsnodate No 'DATE' in 0-th HDU of output FITS. --outfitsnoversions No versions in 0-th HDU of output FITS. --outhdu=STR HDU/extension in output for --copykeys. -o, --output=STR Output file name (not for keywords). -O, --colinfoinstdout Column info/metadata when printing to stdout. --tableformat=STR Table fmt: 'fits-ascii', 'fits-binary', 'txt'. -T, --type=STR Type of output: e.g., int16, float32, etc... HDU (extension) information: --datasum Calculate HDU's datasum and print in stdout. --datasum-encoded 16 character string encoding of '--datasum'. --hasimagehdu File has at least one image HDU. --hastablehdu File has at least one table HDU. --listallhdus List all HDUs within the file. --listimagehdus List all image HDUs within the file. --listtablehdus List all table HDUs within the file. -n, --numhdus Print number of HDUs in the given FITS file. --pixelareaarcsec2 Pixel area in arc-seconds squared. --pixelscale Return the pixel-scale of the HDU's WCS. --skycoverage Image coverage in the WCS coordinates. HDU (extension) manipulation: -C, --copy=STR/INT Copy extension to output file. -k, --cut=STR/INT Copy extension to output and remove from input. --primaryimghdu Copy/cut image HDUs to primary/zero-th HDU. -R, --remove=STR/INT Remove extension from input file. Keywords (in one HDU): -a, --asis=STR Write value as-is (may corrupt FITS file). --copykeys=INT:INT/STR,STR Range/Names of keywords to copy in output. -c, --comment=STR Add COMMENT keyword, any length is ok. -d, --delete=STR Delete a keyword from the header. -H, --history=STR Add HISTORY keyword, any length is ok. -l, --keyvalue=STR[,STR,...] Only print the value of requested keyword(s). --printkeynames Print all keyword names. -p, --printallkeys Print all keywords in the selected HDU. -r, --rename=STR,STR Rename keyword, keeping value and comments. -s, --datetosec=STR FITS date to sec from 1970/01/01T00:00:00 -t, --date Set the DATE keyword to the current time. -u, --update=STR,STR Update a keyword value or comments. -v, --verify Verify the CHECKSUM and DATASUM keywords. --wcscoordsys=STR Convert WCS coordinate system. --wcsdistortion=STR Convert WCS distortion to another type. -w, --write=STR Write a keyword (with value, comments and units). Meta-image creation: --edgesampling=INT Number of extra samplings in pixel sides. --pixelareaonwcs Image where pixels show their area in sky (WCS). Operating modes: -?, --help give this help list --checkconfig List all config files and variables read. --cite BibTeX citation for this program. --config=STR Read configuration file STR immediately. --config-prefix=STR Custom prefix of option names config files. --lastconfig Do not parse any more configuration files. --minmapsize=INT Min. bytes to avoid RAM automatically. --onlyversion=STR Only run if the program version is STR. -P, --printparams Print parameter values to be used and abort. --quietmmap Don't print mmap'd file's name and size. -q, --quiet Only report errors, remain quiet about steps. -Q, --quitonerror Quit if there is an error on any action. -S, --setdirconf Set default values for this directory and abort. --usage give a short usage message -U, --setusrconf Set default values for this user and abort. -V, --version print program version Mandatory or optional arguments to long options are also mandatory or op- tional for any corresponding short options. GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/ REPORTING BUGS Report bugs to bug-gnuastro@gnu.org. COPYRIGHT Copyright (C) 2015-2025 Free Software Foundation, Inc. License GPLv3+: GNU General public license version 3 or later. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written/developed by Mohammad Akhlaghi SEE ALSO The full documentation for Fits is maintained as a Texinfo manual. If the info and Fits programs are properly installed at your site, the command info Fits should give you access to the complete manual. GNU Astronomy Utilities 0.24 November 2025 FITS(1)
NAME | SYNOPSIS | DESCRIPTION | REPORTING BUGS | COPYRIGHT | SEE ALSO
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