`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]

