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This bug was fixed in the package mksh - 39.3-1ubuntu1

---------------
mksh (39.3-1ubuntu1) lucid; urgency=low

  * Merge from Debian unstable. (Closes LP: #529559)
    New upstream version. (Closes LP: #355883)
    This integrates a workaround for a gcc bug. (cf. LP: #375604)
    Remaining Ubuntu changes:
    - debian/control, debian/rules: Exclude dietlibc on powerpc/ppc64
      and sparc (cf. LP: #381332)
    - debian/README.Debian, debian/mksh.postinst: Hardcode installing
      mksh as /bin/sh to false (cf. LP: #348872) but retain debconf
      infrastructure so that, if set to true in old installations, it
      will correctly be removed on upgrade

mksh (39.3-1) unstable; urgency=low

  * New upstream version R39c; shortened ChangeLog since R39:
    - [tg] Build system, code, docs and testsuite cleanup, also style(9)
    - [tg] Parse and evaluate ${parameter op word} correctly
    - [tg] Fix possible SIGSEGV in interactive mode bind builtin due to
      mis-optimisation of gcc combined with a bogus prototype;
      discovered by Grml.org's Frank Terbeck (ft), thanks!
    - [tg] Clean up some more strict *roff or compiler warnings: dashes,
      undefined macros; casting errors (constness, signedness, type
      width/class) and catch possibly unaligned pointer dereferences
      early; remove code/rodata redundancies, plug memory leaks
    - [smultron] Tweak the manual page: point out the word “colour”
    - [tg] Optimise dot.mkshrc DJB’s CDB hash implementations; add Bob
      Jenkins’ one-at-a-time hash (standard and leading-bit
      initialised); fix signedness in expressions; let the hashes use
      stdin if "$*" is empty, like Lb64{en,de}code; use
      “[[ -o utf8-mode ]]” ipv “[[ $- = *U* ]]”
    - [tg] Build.sh portability fixes: missing prerequisite headers;
      ensure $CC is never called without $CFLAGS; fix test.sh, et al.
    - [tg] Optimise internal variable representation; use one-at-a-time
      hash; cache hash values for faster resizing at zero memory cost;
      clean up hash table (keytab) code; switch hash table collision
      resolution algorithm to Python’s; prepare for later changes
    - [tg] Fix type errors in the source code (int → bool, size_t,
      mksh_uari_t)
    - [tg] Fix “${foo:bar:$baz}” not working (missing substitute() call)
    - [tg] Implement “typeset ±a” as nop
    - [tg] Support ksh93-like “${!foo[@]}” listing the keys (indicēs) of
      all set array elements
    - [tg] Support bash/ksh93-like “array=([key]=value …)” and
      (additionally) “set ±A array -- [key]=value …” to directly
      specify indicēs to use
    - [tg] Document the optional, unsupported, printf(1) builtin in TFM
    - [tg] Replace realpath(3) dependency and internally used
      get_phys_path() pdksh code with own implementation; always offer
      the realpath builtin
    - [tg] Implement nameref='typeset -n' (bounded variables) like AT&T
      ksh93 but with mksh-style nested/dynamic scoping and on-use
      resolving; they cannot currently be stored in an array though
    - [tg] Add “chdir” builtin doing the same as “cd” special builtin
    - [tg, David Korn] Document more differences between mksh (and
      pdksh) and AT&T ksh (or, more specific, ksh88, ksh93) in the
      manual page
    - [tg] Support “'a'” as an alternative to “1#a”, like ksh93 does
    - [tg] Add ksh’s “test -o ?foo”: true if “foo” is a valid shell
      option, where “foo” can be “xtrace” or “-x” or “+x” (these three
      are equivalent)
    - [tg] Support “$'…'” backslash-expanding single-quoted strings, as
      requested by David Korn, with almost the same syntax and semantics
    - [tg] Unify backslash expansion code (C style vs. print builtin)
    - [tg] Support “function stop () {” bashism
    - [tg] For several items in the source code that require order to be
      kept, provide from multiply-included header files; sort correctly
    - [tg] Get rid of unneeded FMONITOR (-m) for shells without job
      control; sync list of flags, comments and manpage with reality
    - [tg] If MKSH_SMALL, reduce size by removing editor functionality
    - [tg] Support VT100 emulator style {Ctrl,Alt}-CurLeft/Right keycode
      sequences with new vt100-hack emacs bind function (LP: #355883)
    - [cnuke, tg] Remove more, like GNU bash extensions, from MKSH_SMALL
    - [tg] Remove more functionality, such as Emacs command line editing
      mode bind key macros, and other extensions, from MKSH_SMALL to
      help floppies
    - [tg] Make forking and subshells less expensive wrt. random state
    - [tg] Build and source code fixes for / caught by SUNWcc, HP aCC,
      pcc, DEC ucode cc (MIPS), GCC, LLVM clang
    - [tg] Make undef/def MKSH_NOVI into 0/1 MKSH_S_NOVI build flag
    - [tg] Get rid of "U getenv" in nm output, we already import environ
    - [tg] Simplify $RANDOM handling: reads are now either arc4random(3)
      (if available: set +o arc4random is no longer possible) or an LCG;
      writes are arc4random_pushb(3) if available for explicit writes,
      arc4random_addrandom(3) otherwise, or another one-at-a-time hash
      feeding the LCG; furthermore, RANDOM is now always exported to and
      imported from (implicit read: no push to kernel done) the
      environment vector on startup and spawning
    - [tg] Document mksh does not exactly use OPTU-8/OPTU-16 in the
      manpage, as well as when characters, octets, or screen columns
      are used
    - [tg] Fix exit 127 on "mksh /tmp/horsies" ipv of 1 on ENOENT,
      #548744
    - [Clint Adams] Fix typos in the testsuite
    - [tg, Clint Adams] Begin a shared testsuite for mksh and posh
    - [tg] Make 「((foo) || bar)」 and 「((foo) | (bar))」 work
    - [tg] Fix lazy evaluation of assignments by ternary operator,
      #445651
    - [tg] Work around Cygwin bugs (quirks) hindering the testsuite
    - [tg] In FSH mode, “echo [-n] 'foo\x40bar'” shall not be expanded
    - [tg] Let set -- $(false); echo $? return 0 (POSIXly correct) in
      FSH mode, 1 (needed for getopt(1) support) otherwise
    - [tg] Changes of variables inside Bourne style POSIX functions
      indeed affect the current execution environment (of the function
      caller)
    - [tg] Fix getopts behaviour (sync with AT&T ksh93 not ksh88)
    - [tg] “eval $(false)” shall return 0 (Debian Closes: #550717)
    - [tg] Ensure that /* apo'strophes in comments */ work
    - [tg] Overhaul and simplify handling of (special) variables
    - [tg] Further reduce memory (code/data) and import footprint
    - [tg] Use functions without PATH_MAX limit on GNU/Hurd
    - [tg] Fix tab completing pathnames containing ‘:’, ‘=’, ‘$’ or ‘`’
    - [tg] Support ‘-T <tty>’ even if MKSH_SMALL and fix it
    - [tg] Remove "which" alias "whence -p" to allow "which -a" in
      dot.mkshrc and add more examples, some commented out
    - [tg] Fix print_columns() issue with displaying items where
      characters had differing number of octets and columns, and the
      off-by-one which had hidden this problem with 2-octet 1-column
      and 3-octet 2-column chars
    - [tg] Beautify the manpage in both AT&T nroff and GNU groff
    - [tg] Fix null-expansion of “${x%?}” if $x is unset
    - [tg] Make some globbing (${x%?}) operate on characters instead of
      octets; update manual page to reflect that others still do and
      remove wording that let people think we’d ever support POSuX
      character classes
    - [tg] New ${%foo} returning width of $foo in screen columns, or -1
      if $foo contains an ASCII/latin1/Unicode C0/C1 control character
    - [tg] Fix subtle possible portability problem wrt. CHILD_MAX
    - [tg] Honour ±U on command line of an interactive shell
    - [tg] Fix dead stores and other bugs pointed out by the Clang
      static analyser; put assertions in places it has false positives
    - [tg] Plug uninitialised memory access and possible out-of-bounds
      read of a buffer caught by Valgrind; change one memcpy(3) to
      memmove(3) where srcbuf and dstbuf overlap; place (-DDEBUG)
      workaround for false positive
    - [tg] Rework __attribute__ compiler capability check
    - [tg] Apply errno save/restore related fix from (sync with) oksh
    - [tg] Build.sh: output message when switching from
      autoconfiguration to building / output generation (requested by
      Matt “lewellyn” Lewandowsky); use “conftest.c” ipv “scn.c” (to
      please ccache); ...
    - [tg] Allow “unset foo[*]” (keep attributes) and “typeset foo[*]”
      (for forward-compatibility; R39b it’s the same as “typeset foo”)
    - [tg] When persistent history is enabled (but not MKSH_SMALL) and
      used, intertwine the shells concurrently accessing $HISTFILE
      better ⇒ sync on empty or duplicate line as well (requested by
      Maximilian “mxey” Gaß)
    - [tg] Split off “set ±o posix” and “set ±o sh” again, to be
      somewhat more compatible to various old or vendor versions of
      pdksh and mksh:
      + MKSH_BINSHREDUCED sets FSH but not FPOSIX
      + MKSH_MIDNIGHTBSD01ASH_COMPAT depends on FSH but not FPOSIX
      + The echo built-in behaves the same for FPOSIX and FSH
      + File descriptors > 2 are not closed for both FPOSIX and FSH
      + Both “set -o posix” and “set -o sh” call “set +o braceexpand”
      + In contrast to R39 and below, the errorlevel of
        “set -- $(getopt ab:c "$@")” is now the same in ksh and
        FPOSIX mode (0) and only FSH will use the errorlevel of getopt
        (used to be the other way round)
    - [tg] Document some more shortcomings in the mksh(1) manual page
    - Contributed printf.c fixes:
      + [tg] Make printf(1) builtin use “$'…'” mode, like ksh93
      + [tg] Fix const-cleanliness
  * Remove patches now integrated in upstream or no longer needed
  * Bump Standards-Version, no relevant change
  * Apply patches inside the top-level directory
  * debian/source/format: Enforce "1.0" manually, for now
  * debian/README.source: New, by zack's suggestion, to document some
    particulars of the source package and why I'm not using 3.0 yet
  * debian/README.Debian, debian/mksh.docs: New, document dash bug
  * debian/control: I'm sure we don't need to B-D on locales-all [m68k]
  * debian/control: tweak package short description to well-known text
    and sync long description with upstream's
  * debian/copyright: Update, sync with upstream
  * Rename build/ into builddir/ to avoid phony target vs pathname
    conflict in Makefile (debian/rules)
  * debian/rules: Ensure we use the C locale during build (especially
    for patch application collation order)
  * debian/mksh.examples, debian/rules: Split out dh_installexamples args
  * debian/rules: Update for R39c, printf.c.1.14 particulars
  * debian/rules: When building, try with -combine first but retry if it
    fails, like my OpenSuSE Buildservice packages do (cf. LP: #375604)
  * debian/control: Remove DMUA, I'm a DD now
  * debian/diffs/backport-fixes.diff: New, fixes not yet in R39c

mksh (39.1-4) unstable; urgency=low

  * Update danish translation, Tak tazz
  * debian/diffs/backport-echo-noescapes.diff: new, backport fix
    for "echo [-n] 'foo\x40bar'" expanding even in sh mode
  * debian/diffs/*: refresh and bump version number
  * debian/control: Update and correct package description
 -- Thorsten Glaser <tg@xxxxxxxxx>   Sun, 28 Feb 2010 17:32:01 +0000

** Changed in: mksh (Ubuntu)
       Status: Fix Committed => Fix Released

-- 
Jaunty: CTRL-LEFT and CTRL-RIGHT do not work in zsh
https://bugs.launchpad.net/bugs/355883
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