B>unix:exec</B> <EM>path </EM>[function]

<DL COMPACT>
<DT> 
<DD> 
replaces executing EusLisp with another program.
</DD>
</DL>
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<B>unix:wait</B> [function]

<DL COMPACT>
<DT> 
<DD> 
waits for the completion of one of subprocesses.
</DD>
</DL>
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<P>

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<B>unix:exit</B> <EM>code </EM>[function]

<DL COMPACT>
<DT> 
<DD> 
terminates execution and returns <EM>code</EM> as its completion status.
Zero means normal termination.
</DD>
</DL>
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