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- Addendum for Version 1.2
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- SKSH
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- A ksh-like Shell for the Amiga
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- Version 1.2
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- (Copyright) 1989
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- Steve Koren
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- November 19, 1989
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- Addendum to Version 1.2
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- This document describes additions and changes to SKsh since
- version 1.1.
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- Shell name changed
-
- The most obvious change is that the shell is no longer
- called 'Ash'. There are apparently at least two other
- Amiga shells called 'Ash', so I changed the name to avoid
- confusion with those shells. It is now called SKsh ("ess-
- kay-shell", for Steve Koren's shell).
-
- This name change will cause some confusion for this
- release, but hopefully will prevent it in the future. For
- now, note the following:
-
- 1) The .ashrc and .ashinit files are now called
- .skshinit and .skshrc. Delete the old .ashinit file
- and replace it with the new .skshinit file. You can
- simply rename the old .ashrc file to .skshrc.
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- 2) Delete the old Ash binary and replace it with the new
- SKsh binary.
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- Directory expansion bug fixed!!
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- By far the most important change in 1.2 is that I fixed a
- bug in the directory expansion mechanism that was causing
- system crashes at times. This was a very serious bug, and
- I had suspected it was there for quite some time, but it
- took me awhile to find it. It is fixed now. (There was a
- good reason I called the last two releases 'beta' versions!
- :-)
-
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- $LINES and $COLUMNS set automatically
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- The LINES and COLUMNS variables are now set automatically
- when the window is resized. Actually, the are set at the
- next interactive prompt; if you resize the window while
- either editing a command or running a script or function,
- the variables will not be set.
-
- The 'R' option is provided to turn this behavior off if
- desired. When enabled (by default), this provides a very
- nice behavior when combined with the new 'ls' output format
- which uses the COLUMNS variable. You can resize the window
- horizontally and not have messy directories. However,
- window sizes which are too small will confuse the line
- editor. Also, the value set in the COLUMNS variable is two
- less than the actual column width, since the console device
- scrolls at less than the actual width.
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- SKSH Amiga Shell Page 2 Addendum to 1.2
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- Run function changed
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- The 'run' function defined in .skshinit has been changed to
- use the new -s option to which. It will now report an
- error if the command to be run is not found in the search
- path.
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- -s (silent) option added to which
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- A -s option has been added to the which command. which
- will exit silently if the names are not found in the search
- path. Without the '-s' option, it outputs a message in
- this case. The '-s' option is useful in test statements:
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- if [ $(which -s some_file) = '' ]
- then
- echo "some_file not found in search path"
- fi
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- Command Line Editing changes
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- The shift arrow keys can now be used to move to the
- beginning of a line, the end of a line, the first history
- line, or the last history line.
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- Also, an <esc>-. command was added which inserts the last
- parameter of the previous line. See the UserMan
- documentation on command line editing for details.
-
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- force bug fixed
-
- Version 1.1 contained a bug which caused the 'force'
- command to not evaluate all its arguments. The following
- function now works correctly, where it would not before:
-
- function cd {
- force -b cd $*
- dir
- }
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- dir : bug fixed
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- A bug in 1.1 caused a 'dir :' command to enter an infinite
- loop. This has been fixed in 1.2.
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- SKSH Amiga Shell Page 3 Addendum to 1.2
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- ls command enhanced
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- Several enhancements were added to the 'ls' command. Most
- significantly, a '-F' option was added. This option can be
- used to change the output of the command in a customizable
- way. See the entries for the _FILE_S, _FILE_E, _DIR_S,
- _DIR_E, _EXEC_S, and _EXEC_E variables in the Reference
- manual for details. 'ls -F' can be used to, for example,
- underline file names and highlight directory names with a
- different pen color.
-
- The short directory form now has a cleaner output. It will
- examine the longest file name, the value of the $COLUMNS
- variable, and adjust its display accordingly. Thus, if
- there are mostly short file names in the directory, 'ls'
- will use more columns for output.
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- The '-v' option to 'ls' now prints the total file size as
- well as the number of entries printed.
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- .skshinit and .skshrc now movable
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- The two initialization files are no longer required to be
- in the s: directory. They are now searched for in the
- SKSH: directory. If SKSH: points to s:, then the result is
- the same. SKSH: can be changed to any legal directory.
-
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- New tests added
-
- Test expressions can now test for the script bit, the
- archive bit, and the pure bit by using -S, -A, or -P. See
- the test expression section of the user's guide for
- details.
-
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- Break notification
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- Typing the break key (^c) during an SKsh command will cause
- '*** break' to be printed.
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- Recursive copy only on -r option
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- In version 1.1, the copy command always did a recursive
- copy (ignoring the -r option). This has been fixed.
-
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- Touch command added
-
- A new 'touch' command has been added which 1) creates files
- if they do not already exist, and 2) updates the
- modification times on files if they do exist.
-
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- SKSH Amiga Shell Page 4 Addendum to 1.2
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- Clone (-c) option on cp
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- The 'cp' command now supports a -c (clone) option which
- duplicates the file times and protection status on all
- files copied. The clone option is not the default, but can
- be made to act like it with the following alias:
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- alias cp = 'force -b cp -c'
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- quit alias added
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- A 'quit' alias has been added that is like 'exit', but does
- not execute the value of the LOGOUT first.
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- cp buffer size increased
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- The 'cp' buffer size has been increased to 32K from 4K.
- This should reduce thrashing when copying a file to another
- location on the same floppy. Also, the buffer is now
- dynamically allocated, not placed on the stack as with SKsh
- 1.1.
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- chmod command added
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- SKsh now has a built-in chmod command. Permissions can be
- set to an explicit value or added or subtracted. Also,
- more than one file can be operated upon at once. See the
- reference manual for details.
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- Documenation updates
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- The documentation has been updated to reflect the changes
- in 1.2, and some documentation bugs have been fixed. In
- particular, note that the installation instructions have
- changed; please insure that you have correctly performed
- all the steps listed.
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- SKSH Amiga Shell Page 5 Addendum to 1.2
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- Other Notes
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- I am considering this to be the first "real" (non-beta)
- release of SKsh. I will, of course, continue to enhance it in
- the future. I believe most of the critical bugs are worked
- out now; I'm sure there are still some bugs left, but
- hopefully nothing like the directory expansion bug above that
- was causing system crashes.
-
- One final note: be sure that you re-install the .skshinit file
- in the s: directory, since it has changed from version 1.0.
- The .skshrc file has not changed, so that one need not be re-
- installed. (In fact, that is the concept behind having two
- init files; all users changes should be in .skshrc so they
- will not be overwritten by updates of .skshinit.)
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- SKSH Amiga Shell Page 6 Addendum to 1.2
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