h.shell

强大的数学工具包

                               * * * * * * *
                               *    $,!    *
                               * * * * * * *

        "shell commands and branching to a subshell"

        a) If the first input character different from a blank is a
           '$', the rest of the line is executed by a subshell.

        b) Entering a '!' sign causes branching to a subshell.
           Please type `CTRL/D' or "exit" in order to return to
           simcalc

        Shell commands and branching into subshell is not possible
        in sequences and loops.