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### `shell`

`shell(command)`
  :: Execute shell commands described by a string command.

return
  integer
command
  string

Execute shell commands described by a string command by a C function `system()`. This returns the exit status of shell as its return value.

    [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]

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