xsel > choose > <choose_which> <choose_sel>
xsel > choose 1-4 7 8-16 25
xsel > choose 0 ``EXPOSURE > 100"
Choose enables the user to select data by number from an observation catalogue (see make obscat). It is an alternative to typing in the full filenames in the read command. The call to choose clears the previously chosen or read in data, but read may be called as many times as you like after a call to choose.
If you have read in filters, (e.g. by select mkf, or filter ... commands) then you will be asked whether you want to clear the filters. If you say no, you will retain the filters, but the old data will still be cleared.
If choose_which = 0, then you will be prompted for a selection expression, and all those files matching the selection expression will be chosen. The selection expression follows the same syntax as in the select command, and must refer to columns in the obscat. Due to the pecularities of the interface, you cannot enter the selection expression on the command line, but must wait for the prompt.
Examples:
Example 1:
xsel > choose 1-5,7,10-**
Choose items 1-5,7, and 10 to the end of the list of files in the obscat.
Example 2:
xsel > choose 0 > Clear filters? >[yes] > Selection expression >[] datamode.eq.'BRIGHT'
Choose all files of the bright datamode, and delete the old filters.
Parameters:
NAME TYPE PROMPT DEFAULT
=====================================================================
choose_which UNKNOWN Select files from the obs
choose_clear BOOLEAN Clear filters? yes
choose_sel STRING Selection expression
[gtiext] STRING The extension added to the SF to make [2]
the GTI filename
[gtidifflen] INTEGER Length to be removed from SF before 0
appending
[hkext] STRING Extension added to the SF to make the HK.fits
HK file name
[hkdifflen] INTEGER Length to be removed from SF name before 5
appending
[quiet] BOOLEAN Echo filenames for files not found yes