6.14.12 `shell'
---------------

shell(COMMAND)
     :: COMMAND $B$r%7%'%k%3%^%s%I$H$7$F<B9T$9$k(B.

RETURN
     $B<+A3?t(B

COMMAND
     $BJ8;zNs(B

   * COMMAND $B$r(B C $B$N(B `system()' $BH!?t$K$h$j%7%'%k%3%^%s%I$H$7$F<B9T$9$k(B.
     $B%7%'%k$N=*N;%9%F!<%?%9$rJV$9(B.

     [0] shell("ls");
     alg           da            katsura       ralg          suit
     algt          defs.h        kimura        ratint        test
     alpi          edet          kimura3       robot         texput.log
     asir.o        fee           mfee          sasa          wang
     asir_symtab   gr            mksym         shira         wang_data
     base          gr.h          mp            snf1          wt
     bgk           help          msubst        solve
     chou          hom           p             sp
     const         ifplot        proot         strum
     cyclic        is            r             sugar
     0
     [1]

