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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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