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。

Version 5.2.14

* bug fixes
    * test: -nt(-ot) now succeed if second (first) file doesn't exist and the
      other does.
    * time: now accepts the -p (posix) option.
    * vi: failed redo (.) commands no longer return the line to the shell.
    * emacs: bind commands in .profile/$ENV no longer overridden by tty
      settings.
    * heredocs: now saved in memory to avoid temp files disappear too soon.
    * time: commands at the end of a pipeline can now be timed.
    * on startup: MAILCHECK,TMOUT,SECONDS values from environment are honoured.
    * trap: exit traps now executed in subshells (without explicit exit call).
    * eval: if given empty command while in non-posix mode, exit status is
      that of last command substitution (if any).
    * trap: if first argument is "exit", it is taken as a command not a signal.
    * pwd: config test & code to work around bug in hpux 10.x getcwd().
    * RANDOM: seed based on both time and pid; different sequence in sub shells.
    * typeset -f: now pretty-prints $(..) and $((..)) correctly.
    * fixed bug in memory allocation which can lead to core dumps.
    * set -o: no longer prints options that have no names.
    * emacs: <esc>. in very fist command no longer dumps core.
    * .: can now dot non-regular files (eg, /dev/null).
    * parsing: bar(); no longer dumps core when function bar is run.
    * variable substitution: ${#array[*]} now prints number of set elements
      in the array (used to print largest index, not what ksh88 did).
    * job control: resuming suspended gnu su no longer hoses su'd shell.
    * job control: fixed possible core dump when waiting for jobs.

* LINENO variable now supported.
* port to cygwin environment on win95/winnt.


Version 5.2.13

* bug fixes
    * functions: $0 in sh-style functions is now the same as the shell's $0.
    * .: fixed possible core dump on clean up.
    * test: a lone -t argument now does a isatty(1) test if not in posix mode.
    * alias: PS2 no longer printed when expanding alias foo="cmd; ".
    * set/typeset/getopts: can have options prefixed with both + and -.
    * typeset -f: now reproduces functions correctly ("function F" vs "F()").
    * alias: options can start with +.
    * set -A: a -- marking end of options is now skipped.
    * errexit option (-e) ignored when reading profile and $ENV files.
    * test: '-x f' now fails for root if f is a file and has no x bits set.
    * $_: set to last arg in interactive shells only.
    * PATH: if $PATH not set on startup, it is set to the default path.
    * extended globbing: allow (pat|pat) within @(...) and ${foo#...} patterns.
    * emacs: ^[_ now behaves as it does in at&t ksh (word from _last_ command).
    * MAIL/MAILCHECK: fixed bug that prevented the `new mail' messages.
    * ${..%..} and ${..#..} now work if compiled as sh.
    * sh: fd's greater than 2 are passed on to executed commands.
    * syntax: accepts "if (( 1 )) then" (also [[ ]]): no ; required before then.
    * substitution: accepts (and ignores) leading : in %, %%, #, ## substitions.
    * .: doting directories no longer allowed.
    * editing: completion after "cmd " now completes files (was command).


Version 5.2.12

* bug fixes
    * editing: shell recognizes window resizes on Dec alphas (config problem).
    * alias: no longer dumps core if alias is in a command substitution.
    * alias: everything after ;\n or \n\n was ignored in aliases.
    * exec: temp files used by here docs in functions now cleaned up on exec.
    * possible core dump when cleaning up environment fixed.
    * vi: set -o vi-show8 now does what it was supposed to do (cat -v like).
    * job control: process group synchronization (needed on systems with
      broken setpgrp()) now works when the pipeline contains built in commands.
    * vi: if set -o vi-tabcomplete, tab works in command mode as well.
    * set/typeset: unset parameters are only reported if they have attributes.


Version 5.2.11

* bug fixes
    * aliases: expansion was reading an extra character (bug added in 5.2.10).


Version 5.2.10

* bug fixes
    * parsing: handling of backslash-newline fixed (esp. in here documents).
    * read: prints prompt if non-interactive and input is a tty.


Version 5.2.9

* bug fixes
    * config: using LDSTATIC no longer generates config error.
    * config: can compile as sh again (--enable-shell=sh).
    * config: should compile on machines with broken "gcc -g"
    * config: fixed test for broken S_IFIFO.
    * config: fixed test for getwd() routine.
    * config: better NeXT support (signal list generated correctly, clock_t
      type detected, enable job control in rlogin sessions)
    * parsing: assignments containing brackets ([]) not treated as commands.
    * editing: terminal column width determined correctly on startup.
    * vi: long prompts truncated (more or less) correctly.
    * file completion: files of the form ~user (no /'s) expanded correctly.

* at&t ksh method for delimiting hidden characters in prompt added (i.e.,
  start prompt with non-printing char and \r, use char to delimit esc codes).


Version 5.2.8

* bug fixes
    * configuration: handle FreeBSD's strange S_ISSOCK.
    * test: added == operator.
    * configuration: fixed opendir/dirent usage.
    * redirections before subshells handled correctly.
    * COLUMNS/LINES are no longer exported when they are automatically set.
    * mail checks and PS1/PS4 expansions removed if compiled as sh.
    * subcommands in PS1 no longer generate bogus warning messages.
    * environment variables not longer messed up on 16-bit machines.
    * unset: now returns non-zero if variable/function isn't set.
    * select: only prints menu first time, if REPLY is null or on blank line.
    * check for `cannot execute' improved, error message says why.
    * typeset: now reports variables with attributes but now value.
    * vi/emacs file completion: does directory listing on zero length names.
    * arithmetic: non-numeric parameters expanded recursively.
    * arithmetic: identifiers in unevaluated part of ?:,&&,|| parsed correctly.
    * functions: unsetting a function within itself is now safe.
    * arrays: unsetting element 0 of an array no longer kills the whole array.
    * co-processes now behave like ksh93 co-processes (and less like ksh88).

* functions declared with "function foo" are treated differently (from those
  declared with "foo()"): $0 is (not) set to the function name, assignments
  before function calls aren't (are) kept in the parent shell.

* vi: added vi-esccomplete option for people who want ESC-ESC completion.

* vi/emacs: now notice window size changes (but not while editing a line).

* emacs: <esc># now does the comment/uncomment thing.

* arithmetic: ++, -- and , added.


Version 5.2.7

* bug fixes
    * vi: commands can be longer that 16 chars...


Version 5.2.6

* bug fixes
    * break/continue: if too big a number is given, last enclosing loop is used.
    * set: set +o now generates a set command that can be saved and executed.
    * COLUMNS/LINES are now exported when they are automatically set.
    * emacs: completion: space not added after directory names.
    * vi: # command inserts # after each newline; # on commented line
      undoes the commenting.
    * some regression tests made less sensitive to their environment.
    * should compile on os/2 again.


Version 5.2.5

* bug fixes
    * configuration: if sig_setjmp() being used, use sigjmp_buf.
    * configuration: test for times() fixed.
    * configuration: ANSI usage of setjmp() and offsetof().
    * echo/print: octal number in \ sequence must start with a 0.
    * echo: don't treat a lone minus as an option.
    * typeset -f: correctly prints functions with select statements.
    * vi: / with no pattern repeats last search.
    * vi: repeat counts no longer effect file completion/expansion.
    * vi: tab-completion now also works in command mode.
    * emacs/vi: ^O key now read as ^O on suns/alphas (was eaten by tty driver).
    * emacs: now has file expansion (^[*).
    * emacs: ^O goes to next command, not next next command.
    * COLUMNS/LINES: environment variables now set on start up.
    * variables: command line assignments can't change readonly variables.
    * arithmetic: giving multiple bases (5#4#3) no longer allowed.
    * arithmetic: when assigning a non-integer variables, base no longer shown.
    * history: fixed replacement bug introduced in last release.
    * history: -1 refers to the previous command, not current fc command.
    * parsing: correctly handles command substitutions starting with a newline.

* full command completion added (both vi and emacs).


Version 5.2.4

* bug fixes
    * PS1 imported from environment again.
    * vi handles prompts with embedded newlines.
    * errors redirecting stderr aren't lost.
    * redirection errors for <&n no longer reported as to >&n.
    * don't do globbing on re-direction targets if not interactive (POSIX).
    * pattern matching in [[ foo = foo*bar ]] now works again.
    * HUP signals are passed on to jobs running in the foreground.
    * $? now valid (ie, not 0) in trap handlers, `...` expressions, etc.
    * noclobber doesn't effect redirections to non-regular files (eg, /dev/null)
    * \newline in here-document delimiters handled correctly.
    * typeset -f now reports unloaded autoload functions properly.
    * ~,~+,~- are not expanded if HOME,PWD,OLDPWD are unset.
    * vi completion/expansion: * not appeded if word contains $.
    * cd: error message contains correct directory string.
    * vi expansion list: printed in column form ala at&t ksh.
    * ^C while reading .profile/$ENV nolonger causes shell to exit.
    * option errors for build-in commands now include command name.
    * emacs completion/expansion: ' and " are treated as word delimiters.
    * fc: replacements (a=b) no longer truncates the command.
    * alias: alias -t -r now cleans out the tracked alias table.

* compile-time configuration changed: configure script --enable-XXX options
  replace the old options.h file.  Use "configure --help" for information
  on what the options do (they are basicly the same as what was in the
  options.h file).  Shell can be configured as a (almost) plain bourne
  shell using the --enable-shell=sh (also generates appropriate man page).
  Installed name of program (ksh or sh) can be modified using configure's
  --program-* options.

* ulimit: added -p (maxproc) option.

* case statements can use the old syntax of {,} instead of in,esac.

* extended file globbing added (eg, f*(bar|Bar) matches f, fbar fBarbar, etc).

* trim expressions can be of the form ${parameter#pattern1|pattern2|...}.

* if compiled as sh, $ENV included only if posix option is set.

* vi: U command added (undo all changes on line).

* the Bugs script has been replaced by a new regression testing system, kept
  in the tests/ directory (contains a perl script which sets up a test
  environment and runs tests, and a bunch of tests).


Version 5.2.3

* bug fixes
    * arrays: set -A and unset now unset whole array.
    * history(complex version): fixed core caused by uninitialized hist_source.
    * getopts: will continue parsing options if called after error.
    * getopts: doesn't print shell name twice in error message.
    * posix: if posix option is set, $0 is always the name of the shell.
    * history: "fc -s foo" now finds foo if it is the most recent command.
    * let: expression errors no longer cause scripts to exit.
    * PS1: does not go into infinite loop if there is an expansion error.
    * configure: memmove/bcopy test has a change of working now.
    * configure: check for flock(), undefine COMPLEX_HISTORY if not found.
    * substitution: tilde substitution works in word part of ${var[-+=?]word}.
    * history: "fc <number>" now edits <number>, not <number> to most recent.
    * cd: two argument form works again.
    * special commands taking assignments (alias,set,etc.): field splitting,
      file globbing, etc. suppressed only for args that look like assignments.
    * command: -V now finds reserved words.

* added support for Korn's /dev/fd tests

* new compile time option: DEFAULT_ENV - if defined, it names a file to
  include if $ENV is not set.

* test -o option: if option starts with a !, the test is negated.  The test
  always fails if the option doesn't exist (so [ -o foo -o -o !foo ] is true
  iff option foo exists).

* new option: set -o nohup (currently on by default) - if set, running jobs
  are not kill -HUP'd when a login shell exits; if clear, they are.  In
  future, this will be clear by default (to act like at&t ksh) - if you don't
  (won't) like this, add "[ -o !nohup ] && set -o nohup" to your .profile.

Version 5.2.2

* bug fixes
    * included c_test.h in distribution (opps).

Version 5.2.1

* bug fixes
    * emacs: buffer no longer overflowed when completing file names/commands.
    * emacs: <ESC><tty-erase-char> now bound to delete-back-word (was ...-char).
    * emacs: ignores a space char after ^V (version), as in at&t ksh.
    * emacs: ^O bound to newline-and-next, ^X^Y bound to list-file.
    * emacs: emacs words now include underscore.
    * vi: set -o markdirs, directories and ^[= now get along.
    * cd: -P no longer leaves .. and . in PWD.
    * cd: if CDPATH set and can't cd, error doesn't contain any of CDPATH.
    * cd: sets PWD properly, on machines without getwd().
    * configuration: unistd.h test fixed (include sys/types before dirent.h).
    * configuration: detects memmove/bcopy's that don't handle overlaps.
    * [[ ... ]] does lazy evaluation (eg, [[ ! -f foo || $(<foo) = bar ]] does
      not evaluate $(<foo) if foo doesn't exist).


Version 5.2.0

* bug fixes
    * vi: completion now allows globbing characters.
    * vi: can deal with very long prompts.
    * vi: . (redo) works after j, k, return.
    * vi: [dyc]% causing backwards motion now gets correct start/end position.
    * vi: complete_word (<ESC>\) no longer rings bell on ambiguous matches.
    * vi: globbing doesn't append * if last component of file has globbing chars.
    * emacs: most commands now take arguments, arguments can be multi digit.
    * emacs: newline-and-next command works more correctly.
    * after set -u, trimming substitutions no longer automatically fail.
    * set -i no longer reports an internal error.
    * FPATH: no longer incorrectly complains about function not being defined.
      by a file; when it connectly complains, shell name in error is correct.
    * set -a; set -o allexport: these now do something.
    * shell deals with non-blocking input (clears non-blocking flag).
    * autoconf: fixed memmove/memcpy tests.
    * ! translation in prompt now done before parameter substitution.
    * siglist.sh works around bug in bash 1.4.3.
    * correct positional parameters accessible in local assignments.
    * (sleep 100&) no longer waits for sleep to complete.

* fc -s option added (same as -e -).

* vi: ^V command (version) added.

* vi: @<char> macros added (@X executes vi commands in alias _X).

* emacs: bind -l lists all command names.

* emacs: goto-history command added.

* emacs: search-char function changed to search-char-forward;
  added search-char-backward (bound to <ESC>^]).

* cd and pwd take -L and -P options; added set -o physical option
  (PWD,OLDPWD no longer readonly).