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! --- shell escape
default range syntax
1,$ ![<Unix command>]
The user's choice of shell is taken from the $SHELL environment vari-
able and used to execute <Unix command> if it is present. Otherwise,
an interactive shell is created. A leading ! is replaced by the pre-
vious shell command. Thus !! executes the previous command. An
unescaped % is replaced by the saved file name. An expanded shell
command is echoed before it is executed. After an interactive shell
exits, the screen is immediately redrawn. If a command was run, the
results are left on the screen, and the user must type a return to
redraw the editing window.
To return to the command directory, type "hcomdir".