1 DIRECTORY FITS\DIRECTORY Dir0me Lists specified directory. Only meaningful for disks and CDroms... 1 DISMOUNT FITS\DISMOUNT Dismounts and unloads currently mounted removable medium (Tape, CDrom...). 1 INITIALIZE FITS\INITIALIZE Initialize the tape. It must be logically mounted to do so... 1 Language CLASS to FITS traductor language DIRECTORY : Lists all files in a directory DISMOUNT : Dismount and unloads the tape INITIALIZE : Initialize the tape HEADER : List the header of current FITS file. LIST [key] : List the headers of all files from current position. MOUNT [Dev:] : Logically mount the tape on the specified device. READ : Read scan from current FITS file. REWIND : Rewind tape (but doesnot dismount it). SELECT : Define writing parameters SKIP N : Skip N (positive or negative, * for all) files on tape. WRITE : Write the current scan or index in FITS format. 1 LIST FITS\LIST [keyword] List the headers of all files from current tape position, or list only the specified FITS keyword. 1 MOUNT FITS\MOUNT Device Logically mount the removable medium on the specified device. (Logical name TAPE_DEVICE is used by default). This command must be used before anything else is done on device (even INIT for tapes). If it was already mounted by the user, the tape is rewound. 1 READ FITS\READ [File0me] [/CHECK] This command is used to Read data from FITS format. Not all FITS tapes may be read by CLASS, and some header information might be incomplete when doing so. On tape, the new scan is read from current tape position, and the tape is left at the beginning of next file. On disks and CDroms, the file name argument is compulsory. Option /CHECK can be used to list the header while reading the file. 1 REWIND FITS\REWIND Rewinds the tape (but does not dismount it). Although CFITS normally keeps track of file numbers on tape, it used to occasionally get lost. In the unlikely event that this happens again, rewinding is the only way to recover correct numbers. 1 SELECT SELECT Parametre Value Defines optional parametres to be used when writing a tape. - SELECT FORMAT Form Determines the format to be used on the output tape. Currently supported formats are I*2 and I*4. They correspond to BITPIX=16 and BITPIX=32 in FITS header. 1 SKIP FITS\SKIP N Skip N (positive or negative) files on tape. If N = *, move to end of tape. 1 WRITE FITS\WRITE [argument] [/CHECK] This command is used to write data in FITS format. The argument interpretation depends on the current device. In disk mode (before any MOUNT was issued), it is interpreted as the name of the FITS file. On tape, there are three possibilities: - FITS\WRITE * writes all the scans currently selected in the CLASS index at end of tape. This command is the most efficient way to write a FITS tape. - FITS\WRITE writes the current scan at the end of the tape - FITS\WRITE HERE writes the current scan at the current tape position. Option /CHECK may be used to list the FITS header while writing the tape files. 1 END