news

一个开放源代码的 AT&T 的 Korn Shell 的复制品, 支持大多数 ksh89 的特性。

* new command line -l option tells shell it is a login session.

* os2 changes completed.

* uses autoconf 2.x (was using 1.x).

Version 5.1.3

* bug fixes
    * fixed bug in arithmetic expression evaluation (||,&& caused core dump).
    * ulimit code now uses rlim_t or quad_t, if appropriate.
    * vi: file completion in command mode of single character filename works.
    * vi: file completion with markdirs set resulted in two trailing /'s.
    * vi: completion/expansion/listing acts like at&t ksh when expand fails.
    * vi: ~ takes count.
    * lines from history file are no longer negative (easy history).
    * Makefile now uses manual extension consistently.
    * fc now allows out of range relative (negative) numbers.
    * functions with elif now printed correctly.
    * FPATH now searched if PATH search fails, as in at&t ksh.

* typeset -f output is readable (and more correct)

* compiles under SCO unix

* more os/2 changes integrated

Version 5.1.2

* bug fixes
    * for i; do ...; done now accepted.
    * leading non-white-space IFS chars no longer ignored (now delimit fields).
    * fixed globbing code so echo /usr/*/make works.

Version 5.1.1

* bug fixes
    * { ..;} allowed instead of do ..;done in for/select loops
    * EOF after ; or & no longer causes syntax error
    * complex history: when shrinking history file, keeps inside buffer space.
    * vi editing: `v' on modified line no longer changes command numbering.
    * ^C in vi/emacs no longer prints two newlines.
    * long arguments (> 255) with globbing characters don't cause core dumps.

* new (un)option, KSH, which compiles out ksh code (for producing minimal sh).

* os/2 changes partly merged.

Version 5.1.0

* bug fixes
    * problem caused by _POSIX_VDISABLE on BSDI machines fixed
    * exit status set to 127 if command file could not be opened
    * profile files processed if basename argv[0] starts with (was $0)
    * PWD now imported properly from environment.
    * emacs code now either uses dynamic buffers or does overflow checking.
    * emacs forward-word and delete-forward-word now work like other emacs's.
    * ^C/^\ in vi/emacs work like at&t ksh (prompt reprinted, even if trapped).
    * history number to command mapping now constant (numbers used to change).
    * configuration: BSD tty now used on ultrix (avoids type ahead problem)
    * eof in the middle of multiline commands now ignored if ignoreeof set.
    * vi space command now works again.
    * pointer mismatch compiler warning for waitpid() call dealt with.
    * emacs internal memory error in command completion fixed.
    * autoloaded functions now work first try.
    * SECONDS parameter now acts like in at&t ksh.

* sense of vi-show8 option changed: 8-bit characters are printed as is by
  default; turning on vi-show8 now causes chars with 8th bit set to be
  prefixed with M-.

* missing sections in man page added (now basicly complete)

* emacs ^V command added: prints ksh version

* vi g command added: moves to most recent history

Version 5.0.10

* bug fixes
    * [[ ]] construct unbroken.
    * the newline after a here document marker is now read properly.
    * blank lines no longer cause $? to be set to 0.
    * mail checking now uses atime/mtime instead of size.
    * changing attributes of exported parameters no longer causes core dump.
    * the last command in a file does not have to end in a newline.
    * empty expressions now treated as 0 (previously generated an error).
    * nul bytes stripped from input.
    * 0241 (M-!) in a command substitution no longer lost.
    * when read used in startup file, line continuation no longer causes crash.
    * very long commands in history no longer cause vi to overwrite memory.
    * easy history: when saving history, avoid going past the end of history.
    * emacs mode no longer entered if EDITOR/VISUAL set to null string.
    * command -p disabled in restricted mode.
    * closed file descriptors are re-closed after a redirection.
    * lone [ (test command) no longer causes globbing code to search directory.
    * if TIMES_BROKEN is defined, ksh_times no longer recurses infinitely.
    * `r r' no longer repeats r command forever.
    * make depend no longer generates backslash followed by a blank line.
    * globbing code now deals with symlinks that point to non-existent files.
    * if the ] is missing in a pattern, the [ matches the [ character.
    * syntax errors in test no longer have two newlines.
    * in vi, G now goes to the oldest history (was newest).
    * configuration: test for sys_siglist now harder for optimizers to break.
    * configuration: look for clock_t in sys/times.h.
    * configuration: use _SIGMAX, if available, for # of signals.
    * SIGHUP now causes builtin read command to exit.
    * wait builtin now returns whenever a traped signal occurs as per POSIX.

* v command now works in vi; anchored searches now work in vi mode (/^ptrn);
  multi-line commands displayed correctly by history.

* echo is now schizophrenic: accepts -n/-e/-E and backslash sequences.

* test -H file added (checks for context dependent files on HPs).

* set -o gmacs and markdirs honoured.

* ansi arrow keys in default emacs key bindings.

* ulimit now takes arithmetic expression (as per Korn book).

* co-processes changed to be more compatible with at&t ksh.

Version 5.0.9

* bug fixes
    * FOO is put in the environment for FOO=bar exec blah.
    * compiles under QNX and with dmake.
    * the file pattern [!a--]* is now invalid (POSIX) (used to match everything)
    * echo "${foo:-"a"}*" no longer the same as echo a*.
    * alternation (brace expansion) fixes:
	* brace expansion done after variable expansion, as in csh/at&t ksh.
	* `echo a{b,c' no longer gives "Missing }" error (it echos a{b,c).
	* expansion only done if there is a comma (ie, `echo {a}' prints {a}).
    * globbing/expansion code passes 0x80 unharmed.
    * "echo ${XX=a*b}" no longer sets XX to "a\200*b".
    * "echo ${unset-a*b}" no longer has \200 in the error message.
    * bad substitution error generated for things like ${x:a}, ${x^a}, etc.
    * `x="a cdef"; echo ${x#a c}' now prints "def" instead of "a a cdef".
    * on systems where /etc/passwd//// is a valid name, echo /etc/pass*/ no
      longer matches /etc/passwd.
    * trace output (set -x) flushed correctly, PS4 initialized.
    * ulimit output ungarbled, code to use {set,get}ulimit (if available)
      enabled.
    * tilde expansion done in word part of ${foo-~/bar}
    * when reading stdin (ie, ksh -s), no longer reads too much.
    * shell handles i/o redirection and errors in builtin commands as per
      POSIX (still have to sort out variable assignment errors).
    * starting jobs that save/change/restore tty settings in the background
      no longer messes up tty settings when job finishes.
    * the pattern [a'-'z] now matches three characters, not 26, and
      the pattern [ab']'] also matches three characters.

* a mostly complete man page! (work is still in progress)

* quoting inside $(..) mostly works.

* error reporting has been orthogonalized.

* brace expansion on by default (can be disabled with set +o braceexpand, or
  set -o posix).

* output of "set -o" now fits on a normal screen.

* co-processes added (|&, read -p, print -p, etc.).

* restricted mode added (for what its worth).

* vi now prints meta characters with M- prefix, unless vi-show8 option is on.

Version 5.0.8

* bug fixes
    * two problems in fc (introduced in 5.0.7)
    * install target in Makefile missing a dollar

Version 5.0.7

* POSIX command command added

* a few bug fixes
    * now compiles with various options undefined (eg, VI, EMACS, JOBS).
    * fixed typos in Makefile.in (maxext -> manext) and ksh.1 (\f -> \fP).
    * CLK_TCK defined to correct value for FreeBSD 1.1.5 (and earlier?).
    * original process group restored when an exec is done.
    * the exit value of set is that of the last $(...) on the command line.
    * ditto for a command with no command (eg, x=`false`).
    * command variable assignments done before path search (so PATH=... x works)
      and are added as they are processed (so A=1 B=$A works).
    * variable assignments infront of function calls are exported to programs
      inside the function.
    * aliases with trailing space are only honoured in command contexts
      if in posix mode.

* make depend target added; install target warns if ksh not in /etc/shells.

* set -o bgnice now does something.

* vi mode: ESC is no longer a file completion command (too annoying).

Version 5.0.6

* most reported bugs/problems fixed (all but two).

* temporary files now created in $TMPDIR (if it is a sane path).

Version 5.0.5

* function parsing POSIXized (function bodies can be any compound command,
  redirections after functions effect function invocation, not the
  instantiation, the () in a function definition now parsed as two tokens).

* exit bultin now does stopped jobs check.

* set -p/-o priviliged supported.

* test builtin now believed to be completely posix.

* a default path is now used when PATH is not set (defined in options.h).

Version 5.0.4

* configuration checks for buggy opendir()s and setpgrp()s.

* autoloading functions now supported.

* functions can safely redefine themselves.

Version 5.0.3

* hash command changed to "alias -t"; whence -p added; print -s added
  (all as in at&t ksh); unalias -a added (POSIX).

* test builtin POSIX complient

* TMOUT parameter supported (at&t ksh: timeout interactive shells)

Version 5.0.2

* trap/error handling changed to eliminate longjmp()s from signal handlers;
  trap ERR added.

* ksh conditional expressions ([[ .. ]]) supported.

* arithmetic expressions (let, $((..)), etc.) now understand full C
  integer expressions (except ++/-- and sizeof()).

* typeset -L -R -Z -u -l added (as in at&t ksh)

* at&t/posix $(( .. )) arithmetic expansions supported.

Version 5.0.1

* set -e no longer effects commands executed as part of if/while/until/&&/||/!
  condition.

* posix ! keyword now recognized.

* posix getopts; if not in posix mode, getopts will accept options starting
  with + (at&t kshism)

* syntax error messages improved (says what was unexpected/unmatched)

Version 4.9+mun.5

* all known bugs related to job control fixed:
    * fg,bg,jobs,wait,kill commands fully POSIX complient
    * signals are no longer reported for foreground jobs killed by SIGINT and
      SIGPIPE
    * pipeline process groups now created more reliablely (was a problem
      if first process exited before second process exec'd).
    * "(: ; cat /etc/termcap) | sleep" nolonger hangs

* save/restore tty mode if command succeeds/fails, respectively.  Edit
  mode (emacs,vi) no longer use old tty mode information

* test command: added -h

* alternations option renamed to braceexpand (eg, use set -o braceexpand).
  Old usage (set -o alternations) still accepted (will disappear in next
  version).

* trap/kill now accept upper and lower case signal names.

Version 4.9+mun.3

* here documents in functions now work properly

* read command: added -s option, use REPLY if no variable specified

* don't accept "while command; done" as a valid command

* fg,bg,jobs,wait,kill commands mostly POSIX complient.

* unset command: added POSIX -v option

* set command: added -A option

* handle ${array[@]} and ${array[*]}

* compiles with old bsd 4.2 compiler (pcc)

* new versions of etc/profile and etc/ksh.profile

Version 4.9+mun.2 (versus 4.9)

* directory/file structure has been re-arranged:
    * moved files from sh directory up a level, deleted sh directory
    * created misc directory, old ChangeLog,README,.. files moved to misc

* now uses GNU autoconf for compilation.

* no longer uses stdio FILE *'s for I/O redirection (most stdio
  usage has been removed).  Solves many porting problems caused by
  dup'd file descriptors, forked processes and exiting.

* removed lint from code (compiles with very few warning with gcc -O -Wall
  -Wno-comment)

* has array support (needs work but is pretty functional).

* ulimit command now more functional on more machines. Compatable with at&t ksh.

* command line and set option parsing cleaned up, POSIXized.

* POSIX IFS handling.

* many many small bug fixes (see ChangeLog)