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- ASH V0.76
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- Copyright (c) 1986,1987 CSL/jdn
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- This is an ADDENDUM to the ASH V0.70 Document (ash.doc).
- ASH Version 0.76 is a minor update. It's not big enough to warrant a new
- version of the ASH document but there are several significant changes that
- have to be explained and this document does that.
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- There are two new built-in commands included in V0.76. The history buffer
- size is now user definable. There is now an ASH history file that is read
- in when ASH is invoked interactively and written back when ASH exits. The
- ^V character has changed slightly in it's use and the ^B character now has
- meaning. The UP ARROW key is now active for previous command retrieval
- without hitting the escape key. Finally, the environment (set variables)
- is now passed in a manner that will allow programs written to Atari's
- specifications for environment passing to get at them.
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- Another change that doesn't require any documenting is an improved
- readline() function that speeds up the find command and other commands that
- call readline() by a factor of about six.
-
- cmp file1 file2
- The cmp command takes two arguments as file names and compares the
- them line by line. If it finds lines that differ it exits with the
- line number and each of the lines. If one of the files is shorter
- than the other that fact and the line number after which the file
- ended is reported. If there are no differences in the files that's
- reported too. ASCII files are strongly recommended.
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- where cmd [cmd ...]
- The where command takes commands as you would type them into ASH as
- arguments and looks for the arguments using the same search method as
- if it were trying to invoke them. No arguments should be include for
- the commands given as arguments to where. Built-in commands are
- indicated as functions by following them with parentheses. For other
- commands the complete file name, including extension, and the path
- where they were located is printed.
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- The ASH command history buffer can now retain as many command lines as you
- want. The default size is 23 commands. To change the default you define
- the set variable HISTSIZE to the number of history commands you would like.
- This must be done in your ASH initialization file 'ash.ini'. The size of
- the history buffer is ONLY settable during initialization. You can
- redefine the HISTSIZE set variable after initialization but it will not
- effect the size of the history buffer. When listing the history buffer
- commands with the ^L, normal ASH pagination will keep the listing from
- getting away from you.
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- The file 'ash.hst' will be looked for in the same manner that the help file
- (ash.hlp) and the initialization file (ash.ini) are looked for during ASH
- initialization. If it's found the commands in the file will be read in and
- added to the current command history buffer. When ASH exits, the current
- command history buffer will be written back over the same file. If you
- want to create a file of commands to be added to the history, but you don't
- want them to be over written, you can change the history file attributes to
- READ ONLY with the attr command.
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- The UP ARROW key is now active for history buffer command retrieval even
- before you hit the escape key. Now you can immediately start going back
- through previous commands with the UP ARROW. Keep in mind that once you
- start browsing through history commands you are in history edit mode.
- Pressing the UP ARROW is equivalent to pressing the ESC and then the UP
- ARROW.
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- ^V The ^V character now toggles the cursor back and forth between
- visible and invisible instead of always trying to turn the cursor
- on.
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- ^B The ^B character toggles back and forth between a blinking and
- non-blinking cursor.
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- In addition to being able to toggle the cursor attributes the program now
- remembers what the cursor was like before executing an external program and
- resets it on exit. For example, this will make your cursor reappear after
- exiting MicroEMACS.
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- Finally, the environment is now passed to external commands as a string of
- the form:
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- var=val\0var=val\0var=val\0...var=val\0\0
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- Each variable and value is NULL terminated and the entire list is NULL
- terminated as well. This is the way Atari recommended and the way that
- several shells (MWC, Micro C shell) do it now. I'll provide the code for a
- getenv() function you can use in external programs on request.
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