• [ANN] KornShell 93u+m 1.0.0-beta.2

    From Martijn Dekker@21:1/5 to All on Fri Dec 17 04:38:20 2021
    XPost: comp.unix.shell, de.comp.os.unix.shell

    Announcing: KornShell 93u+m 1.0.0-beta.2
    https://github.com/ksh93/ksh

    In May 2020, when every KornShell (ksh93) development project was
    abandoned, development was rebooted in a new fork based on the last
    stable AT&T version: ksh 93u+. This new fork is called ksh 93u+m as a
    permanent nod to its origin. We're restarting it at version 1.0. Seven
    months after the first beta, the second one is ready. Please test this
    second beta and report any bugs you find, or help us fix known bugs.

    We're now the default ksh93 in some OS distributions, at least Debian
    and Slackware! Even though we don't think it's stable release quality
    yet, the consensus seems to be that 93u+m is already much better than
    the last AT&T release.

    Main developers: Martijn Dekker, Johnothan King, hyenias

    Contributors: Andy Fiddaman, Anuradha Weeraman, Chase, Gordon Woodhull,
    Govind Kamat, Harald van Dijk, Lev Kujawski, Marc Wilson, Ryan Schmidt, Sterling Jensen

    HOW TO GET IT

    Please download the source code tarball from our GitHub releases page:

    https://github.com/ksh93/ksh/releases

    To build, follow the instructions in README.md or src/cmd/ksh93/README.

    HOW TO GET INVOLVED

    To report a bug, please open an issue at our GitHub page (see above). Alternatively, email me at martijn@inlv.org with your report.
    To get involved in development, read the brief policy information in
    README.md and then jump right in with a pull request or email a patch.
    See the TODO file in the top-level directory for a to-do list.

    ### MAIN CHANGES between 1.0.0-beta.1 and 1.0.0-beta.2 ###

    New features in built-in commands:

    - 'cd' now supports an -e option that, when combined with -P, verifies
    that $PWD is correct after changing directories; this helps detect
    access permission problems. See:
    https://www.austingroupbugs.net/view.php?id=253

    - 'printf' now supports a -v option as in bash. This assigns formatted
    output directly to variables, which is very fast and will not strip
    final newline (\n) characters.

    - The 'return' command, when used to return from a function, can now
    return any status value in the 32-bit signed integer range, like on
    zsh. However, due to a traditional Unix kernel limitation, $? is
    still trimmed to its least significant 8 bits whenever leaving a
    (sub)shell environment.

    - 'test'/'[' now supports all the same operators as [[ (including =~,
    \<, \>) except for the different 'and'/'or' operators. Note that
    'test'/'[' remains deprecated due to its unfixable pitfalls;
    [[ ... ]] is recommended instead.

    Shell language changes:

    - Several improvements were made to the --noexec shell code linter.

    - Arithmetic expressions in native ksh mode no longer interpret a
    number with a leading zero as octal in any context. Use 8#octalnumber
    instead (e.g. 8#400 == 256). Arithmetic expressions now also behave
    identically within and outside ((...)) and $((...)).

    - POSIX compatibility mode fixes (only applicable with the --posix shell
    option on):
    - A leading zero is now consistently recognised as introducing an octal
    number in all arithmetic contexts.
    - $((inf)) and $((nan)) are now interpreted as regular variables.
    - The '.' built-in no longer runs ksh functions and now only runs
    files.

    Bugs fixed:

    - '.' and '..' are now once again completed by tab completion.

    - If SIGINT is set to ignore, the interactive shell no longer exits on
    Ctrl+C.

    - ksh now builds and runs on Apple's new M1 hardware.

    - The 'return' and 'exit' commands no longer risk triggering actual
    signals by returning or exiting with a status > 256.

    - Ksh no longer behaves badly when parsing a type definition command
    ('typeset -T' or 'enum') without executing it or when executing it in
    a subshell. Types can now safely be defined in subshells and defined
    conditionally as in 'if condition; then enum ...; fi'.

    - Discipline functions, especially those applied to PS2 or .sh.tilde,
    will no longer crash your shell upon being interrupted or throwing an
    error.

    - Fixed a bug that could corrupt output if standard output is closed
    upon initialising the shell.

    - Fixed a bug in the [[ ... ]] compound command: the '!' logical
    negation operator now correctly negates another '!', e.g.,
    [[ ! ! 1 -eq 1 ]] now returns 0/true. Note that this has always been
    the case for 'test'/'['.

    - Fixed SHLVL so that replacing ksh by itself (exec ksh) will not
    increase it.

    - Arithmetic expressions are no longer allowed to assign out-of-range
    values to variables of types declared with enum.

    - The 'time' keyword no longer makes the --errexit shell option
    ineffective.

    - Various bugs in libcmd built-in commands (those bound to the
    /opt/ast/bin path by default) have been fixed.

    - Various other crashing bugs have been fixed.

    Fixes for the shcomp byte code compiler:

    - shcomp is now able to compile scripts that define types using enum.

    - shcomp now refuses to mess up your terminal by writing bytecode
    to it.

    ### MAIN CHANGES between ksh 93u+ 2012-08-01 and 93u+m 1.0.0-beta.1 ###

    Hundreds of bugs have been fixed, including many serious/critical bugs.
    This includes upstreamed patches from OpenSUSE, Red Hat, and Solaris, fixes backported from the abandoned 93v- beta and ksh2020 fork, as well as many
    new fixes from the community. See the NEWS file for more information, and
    the git commit log for complete documentation of every fix. Incompatible changes have been minimised, but not at the expense of fixing bugs. For a
    list of potentially incompatible changes, see src/cmd/ksh93/COMPATIBILITY.

    Though there was a "no new features, bugfixes only" policy, some new
    features were found necessary, either to fix serious design flaws or to complete functionality that was evidently intended, but not finished.
    Below is a summary of these new features.

    New command line editor features:

    - The forward-delete and End keys are now handled as expected in the
    emacs and vi built-in line editors.

    - In the vi and emacs line editors, repeat count parameters can now also
    be used for the arrow keys and the forward-delete key. E.g., in emacs
    mode, <ESC> 7 <left-arrow> will now move the cursor seven positions to
    the left. In vi control mode, this would be entered as: 7 <left-arrow>.

    New shell language features:

    - The &>file redirection shorthand (for >file 2>&1) is now available for
    all scripts and interactive sessions and not only for profile/login
    scripts, bringing ksh 93u+m in line with mksh, bash, and zsh.

    - File name generation (a.k.a. pathname expansion, a.k.a. globbing) now
    never matches the special navigational names '.' (current directory)
    and '..' (parent directory). This change makes a pattern like .*
    useful; it now matches all hidden files (dotfiles) in the current
    directory, without the harmful inclusion of '.' and '..'.

    - Tilde expansion can now be extended or modified by defining a
    .sh.tilde.get or .sh.tilde.set discipline function. This replaces a
    2004 undocumented attempt to add this functionality via a .sh.tilde
    command, which never worked and crashed the shell. See the manual for
    details on the new method.

    New features in built-in commands:

    - Usage error messages now show the --help/--man self-documentation options.

    - Path-bound built-ins (such as /opt/ast/bin/cat) can now be executed by
    invoking the canonical path, so the following will now work as expected:
    $ /opt/ast/bin/cat --version
    version cat (AT&T Research) 2012-05-31

    - 'command -x' now looks for external commands only, skipping built-ins.
    In addition, its xargs-like functionality no longer freezes the shell on
    Linux and macOS, making it effectively a new feature on these systems.

    - 'redirect' now checks if all arguments are valid redirections before
    performing them. If an error occurs, it issues an error message instead
    of terminating the shell.

    - 'suspend' now refuses to suspend a login shell, as there is probably no
    parent shell to return to and the login session would freeze.

    - 'times' now gives high precision output in a POSIX compliant format.

    - 'typeset' now gives an informative error message if an incompatible
    combination of options is given.

    - 'whence -v/-a' now reports the location of autoloadable functions.

    New features in shell options:

    - A new --globcasedetect shell option is added on OSs where we can
    check for a case-insensitive file system (currently Windows/Cygwin,
    macOS, Linux and QNX 7.0+). When this option is turned on, file name
    generation (globbing), as well as file name tab completion on
    interactive shells, automatically become case-insensitive on file
    systems where the difference between upper and lower case is ignored
    for file names. This is transparently determined for each directory, so
    a path pattern that spans multiple file systems can be part
    case-sensitive and part case-insensitive.

    - A new --nobackslashctrl shell option disables the special escaping
    behaviour of the backslash character in the emacs and vi built-in
    editors. Particularly in the emacs editor, this makes it much easier to
    go backward, insert a forgotten backslash into a command, and then
    continue editing without having your next cursor key replace your
    backslash with garbage. Note that Ctrl+V (or whatever other character
    was set using 'stty lnext') always escapes all control characters in
    either editing mode.

    - A new --posix shell option has been added to ksh 93u+m that makes the
    ksh language more compatible with other shells by following the POSIX
    standard more closely. See the manual page for details. It is enabled by
    default if ksh is invoked as sh, otherwise it is disabled by default.

    - Enhancement to -G/--globstar: symbolic links to directories are now
    followed if they match a normal (non-**) glob pattern. For example, if
    '/lnk' is a symlink to a directory, '/lnk/**' and '/l?k/**' now work as
    you would expect.

    --
    || modernish -- harness the shell
    || https://github.com/modernish/modernish
    ||
    || KornShell lives!
    || https://github.com/ksh93/ksh

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