HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.

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Special Characters

XPI recognizes the following special characters: 


! - indicates the rest of the line is a comment
@ - starts reading commands from a command file
$ - spawn to the system
" - protects other special characters
= - seperate parameter-value pairs


As a result, you should observe the following rules when entering expressions on the command line.


  • An argument with imbedded spaces must be delimited by double quotes.

  • An argument containing an @ or a ! must be surrounded by double quotes.

  • = signs are trapped by XPI, so use .eq. in selection expressions, or surround your expressions with double quotes. In fact, to be safe it is always best to do this anyway.



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Last modified: Tuesday, 10-Jan-2023 11:03:00 EST

HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.