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<!--Copyright (C) 1988-2005 by the Institute of Global Environment and Society (IGES). See file COPYRIGHT for more information.-->


Any expression preceded by a <code>!</code> will be executed as a
shell command from the GrADS command line. 

<H3>Usage Notes</H3>
Output from the shell command will be displayed in the Grads command
window. If the shell command is executed from a Grads script, the
output will not returned as a string buffer to the script.