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.
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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