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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$ - spawn or exit to shell

Execute an operating system command. 

xsel >  $ <command_line>

where command_line contains a UNIX command. No parsing of $<$command_line$>$ is done by the XPI parser, therefore all the $'s, skipped fields, double quotes etc have the meaning they would in an operating system command. Also $<$command_line$>$ must be 80 characters or less.

If the dollar sign is entered with no $<$command_line$>$ the program opens a new shell, and a series of commands can be entered – type exit to get back into XSELECT. Spawning can be disabled by setting the environment variable DIASBLE_SPAWN.

Examples: 

xsel > $

Spawns a shell. 

xsel >  $ls

Lists the contents of the current directory. 

xsel >  $cp triala0.pha x1822a0.pha;   ls *.pha;   exit

starts up a shell, copies a file and returns to XSELECT. The $ can even be given in reply to a prompt: 


xsel >  set datadir
> Enter the event file directory > [] $
%ls
...
%exit
> Enter the event file directory > []



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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.