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# Called program - stdin/stdout

In Unix the verb defined below calls a program, writes to its standard input, and reads its output.

    run=: 4 : 0
    'p o i'=. 2!:2 x.   NB. Run command, save Process, Output, Input
    y. fwrite i         NB. Write to its input
    fclose i            NB. Close its input
    2!:3 p              NB. Wait for process to terminate
    z=.fread o          NB. Read its output
    fclose o            NB. Close its output
    z                   NB. Result
    )

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