path: root/bin/ksh/NEWS

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).


$OpenBSD: NEWS,v 1.15 2007/08/02 11:05:54 fgsch Exp $

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).

* 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 trapped 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. Compatible with at&t ksh.

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

* POSIX IFS handling.

* many many small bug fixes (see ChangeLog)