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1 This is a list of changes that have been made since the 12/28/93 version
2 of ksh.
4 1. New features in 12/28/93b
5 a. If IFS contains two consecutive identical characters belonging
6 to the [:space:] class, then this character is treated as
7 a non-space delimiter so that each instance will delimit
8 a field. For example, IFS=$'\t\t' will cause two consecutive
9 tabs to delimit a null field.
10 b. The getopts command has a -a name option that specifies a
11 name that will be used for usage messages.
13 2. New features in 12/28/93e
14 a. The math functions, atan2, hypot, fmod, and pow were added.
15 b. When a shared library is loaded, if the function lib_init()
16 is defined in the library, it is invoked the first time that
17 the library is loaded with builtin -f library.
19 3. New features in 12/28/93f
20 a. Hostnames in addition to host addresses can be given in
21 /dev/tcp/host/port virtual file names.
22 b. File name completion and expansion now quotes special
23 characters in file names from both emacs and vi edit modes.
25 4. New features in 12/28/93g
26 a. The pipefail option has been added. With pipefail
27 enabled, a pipeline will not complete until all
28 commands are complete, and the return value will
29 be that of the last command to fail, or zero if
30 all complete successfully.
31 b. When an executable is found on a given path,
32 the appropriate library path variable is prepended
33 with a corresponding library directory.
34 5. New features in 12/28/93h
35 a. The PATH search algorithm has been modified to look
36 for a file named .fpath in each bin directory and if
37 found, to search for functions in this directory if
38 it cannot find the command in that directory.
39 b. When performing pathname expansion, the shell checks
40 to see whether each directory it reads is case sensitive
41 or not, and performs the matching accordingly.
42 c. The %T format for printing formatted date/time.
43 6. New features in 12/28/93i
44 a. Most of the built-in commands and ksh itself are now
45 self documenting. Running command --man will produce
46 screen output. Running command --html produces the
47 man page in html format.
48 b. The getopts builtin can process command description
49 strings to produce man pages.
51 7. Bugs fixed in 12/28/93a for default OPTIONS
52 a. An expansion bug which causes portions of a word after
53 a $((...)) expansion that contains a nested $var expansion
54 to be lost has been fixed.
55 b. A bug that caused a core dump when a script that did not
56 have PWD set and did a cd inside command substitution
57 has been fixed.
58 c. A bug which caused a core dump on some machines when
59 the LANG variable was assigned to has been fixed.
60 d. A bug which incorrectly handled set disciplines that
61 performed arithmetic evaluation when the discipline
62 was called from the arithmetic evaluator has been fixed.
63 e. A bug caused by an EXIT trap inside a function that
64 was executed in a subshell was fixed.
65 f. If foo is a function, and not a program, then command foo
66 now reports that foo isn't found rather than invoking foo.
67 g. The previous version incorrectly listed -A as an
68 invocation option. The -A option is only for set.
69 h. A bug was fixed which caused ksh to loop when execution trace
70 was enabled and the PS4 prompt required command substitution.
71 i. A bug which could cause the job control switch character
72 to be disabled when a script that enabled monitor mode
73 terminated was fixed.
74 j. A bug in the macro expansion global replacement operator //,
75 when the pattern began with a [ or +( has been fixed.
76 k. A bug which prevented ~ expansion from occurring when
77 it was terminated with a colon inside an assignment
78 has been fixed.
79 l. A bug in the dot command which prevented autoload functions
80 from working has been fixed.
81 m. A bug which caused a variable to be unset if the
82 its value were expanded inside a set discipline has
83 been fixed.
84 n. Whence -a now longer reports that a defined function
85 is undefined.
86 o. A bug on some systems in which $0 would be incorrect
87 in scripts invoked by name has been fixed.
88 p. Here documents with an empty body now work.
89 1. A bug which disabled argument passing and resetting
90 of options for a script invoked by name inside a
91 function has been fixed.
92 r. A bug in which an EXIT trap set the caller of a function
93 would be executed if a command called inside a function
94 was not found has been fixed.
95 s. A bug which allowed a script to trap signals that are
96 ignored at the time that the shell was invoked has
97 been fixed.
98 t. A bug which caused 2<&1- when applied to a shell built-in
99 to leave standard input closed has been fixed.
100 u. A bug which caused the shell to incorrectly parse
101 $() command substitutions with nested case statements
102 has been fixed.
104 8. Bugs fixed in 12/28/93b for default OPTIONS
105 a. A bug which caused unset RANDOM to dump core has been
106 fixed.
107 b. A bug which prevented return for terminating a profile
108 or ENV file has been fixed.
109 c. A bug which prevented standard input from being
110 directed to /dev/null for background jobs when
111 monitor mode was turned off has been fixed.
112 d. Statements of the form typeset -options var[expr]=value
113 did not perform substitutions on expr as expected.
114 e. A bug which prevented the shell from sending a HUP
115 signal to some background jobs that were not disowned
116 has been fixed.
117 f. A bug which allowed a script to trap signals that are
118 ignored at the time that the shell was invoked by exec
119 has been fixed.
120 g. A bug which could cause a core dump when a discipline
121 function was unset within a discipline was fixed.
122 h. The typeset builtin now accepts a first argument of
123 + or - for compatibility with ksh88.
124 i. For compatibility with ksh88, the results of expansions
125 of command arguments will treat the extended character
126 match characters ()|& as ordinary characters.
127 j. A bug which caused read to fail on a file that was
128 open for read/write with <> when the first operation
129 was print or printf has been fixed.
130 k. When a job is suspended, it is put on the top of
131 the job list as required by the POSIX standard.
132 l. The value of OPTARG when an option that required
133 an argument but didn't have one was incorrect in the
134 case the the option string began with a :.
135 m. A bug which caused the terminal to get into a bad
136 state with some KEYBD traps in vi-mode has been fixed.
137 n. A bug which caused an invalid trap to cause a script
138 to terminate, rather than just return an error, has
139 been fixed.
140 o. Backreferencing sub-expressions in patterns and replacement
141 strings now works.
142 p. A bug in chmod which caused the -R option to fail has
143 been fixed.
145 9. Bugs fixed in 12/28/93c for default OPTIONS
146 a. The expansion of "$@" was incorrect when $1 was the null
147 string.
148 b. A bug which could incorrectly report a syntax error in
149 a backquoted expression when a $ was preceded by \\
150 has been fixed.
151 c. A bug which prevented the shell from exiting after
152 reporting an error when failing to open a script
153 has been fixed.
154 d. A bug that could lead to memory corruption when a
155 large here document that required parameter or command
156 substitution was expanded has been fixed.
157 e. A bug that could cause a core dump on some systems
158 after ksh detected an error when reading a function
159 has been fixed.
160 f. A bug which could cause a coprocess to hang when
161 reading from a process that has terminated has been fixed.
162 g. A bug which caused a script to terminate when set -e
163 was on and the first command of and && or || list
164 failed has been fixed.
165 h. A bug with here documents inside $(...) when the delimiter
166 word is an identifier has been fixed.
167 i. A bug which caused $0 to display the wrong value when
168 a script was invoked as an argument to the . command
169 and the eval command has been fixed.
170 j. A bug that could cause the built-in sleep to hang
171 has been fixed.
172 k. A bug introduces in 12/28/93b which caused the backslash
173 to be removed when it was followed by digit inside double
174 quotes in some instances has been fixed.
175 l. A bug which could cause a core dump if ksh was invoked with
176 standard input closed has been fixed.
177 m. A bug which could cause a core dump if typeset -A was
178 specified for an existing variable has been fixed.
179 n. Variables that were unset but had attributes such as readonly
180 and export were not listed with readonly, export and typeset.
181 o. Several problems with signals have been fixed.
182 p. A bug which prevented ulimit -t from working has been fixed.
183 Also, a bug in which failed ulimits could cause a core dump
184 has also been fixed.
185 q. A bug in expansion of the form ${name/#pattern/string} and
186 ${name/%pattern/string} has been fixed.
187 r. A bug which caused read -r on a line that contained only
188 blanks to get a non-null value has been fixed.
189 s. A bug introduced in the 'a' point release in which
190 ${x='\\'} expanded to \ when x was unset has been fixed.
191 t. A bug which prevented a trap on EXIT from being executed
192 when the last command in a script was a function invocation
193 has been fixed.
194 u. A bug which caused an interactive shell ignore input when
195 standard error was redirected to a file with exec,
196 and then restored with exec 2>&1 has been fixed.
197 v. An interactive shell turns on monitor mode even when
198 standard error has been redirected to a file.
199 w. A bug which could cause standard input to be incorrectly
200 positioned for the last command of a script has been fixed.
201 y. A bug in the edit modes which allowed walking back in
202 the history file for more than HISTSIZE commands has
203 beed fixed.
204 z. A bug which could cause a core dump if variable TMPDIR was
205 changed between two command substitutions has been fixed.
206 aa. A bug which prevented a trap on EXIT from being cleared
207 has been fixed.
209 10. Bugs fixed in 12/28/93d for default OPTIONS
210 a. The \ character was not handled correctly in replacement
211 patterns with ${x/pattern/replace}.
212 b. A bug with read in which the line did not end with
213 a new-line has been fixed.
214 c. A bug in file name generation which sometimes
215 appended a . for filenames that ended in / has
216 been fixed.
217 d. If a process is waited for after a status has
218 been returned by a previous wait, wait now
219 returns 127.
220 e. A bug with hist (fc) -e which prevented a command
221 to re-executed after it had been edited has been fixed.
222 f. A bug which prevented quoting from removing the meaning
223 of unary test operators has been fixed.
225 11. Bugs fixed in 12/28/93e for default OPTIONS
226 a. Empty command substitutions of the form $() now work.
227 b. whence -v foo now gives the correct result after calling
228 builtin -d foo.
229 c. A bug in right to left arithmetic assignment for which
230 the arithmetic expression (( y = x = 1.5 )) did not
231 yield 1 for y when x was declared typeset -i was fixed.
232 d. printf has been fixed to handle format containing \0
233 and/or \0145 correctly. In addition, characters following
234 %b in the format string are no longer displayed when
235 the operand contains \c.
236 e. A bug in printf that could cause the %E format to
237 produce unnormalized results has been fixed.
238 f. A bug which causes some arithmetic expressions to be
239 incorrectly evaluated as integer expressions rather
240 that floating point has been fixed.
241 g. Functions defined inside a subshell no longer remain
242 defined when the subshell completes.
243 h. The error message from sh -c ';echo foo' has been
244 corrected.
245 i. The format for umask -S has been changed to agree
246 with the specification in the POSIX standard.
247 j. A bug that caused side effects in subscript evaluation
248 when tracing was enabled for subscripts using ++ or --
249 has been fixed.
250 k. To conform to the Posix standard getopts has been changed
251 so that the option char is set to ? when it returns with
252 a non-zero exit status.
253 l. The handling of \} inside ${name...} has been fixed so
254 that the \ quotes the }.
255 m. A bug that caused the read builtin to resume execution
256 after processing a trap has been fixed.
257 n. [[ -s file ]] has been fixed so that if file is open
258 by ksh, it is flushed first.
259 o. In some cases attributes and sizes for non exported
260 variables weren't being reset before running a script.
261 p. The value of TMOUT was affected by changes make to
262 it in a subshell.
263 q. The jobs command did not reflect changes make by
264 sending the CONT signal to a command.
265 r. The error message for ksh -o unknown was incorrect.
266 s. Functions invoked as name=value name, did not use
267 values from the calling scope when evaluating value.
268 t. A bug in which the shell would reexecute previously
269 executed code when a shell script or coprocess was
270 run in the background has been fixed.
271 u. A bug in which an empty here-document would leave
272 a file descriptor open has been fixed.
273 v. A bug in which $(set -A array ...) would leave a
274 side effect has been fixed.
275 w. A discipline function for a global variable defined
276 within a function defined with the function keyword,
277 incorrectly created a local variable of the same name
278 and applied the discipline to it.
280 12. Bugs fixed in 12/28/93f for default OPTIONS
281 a. A bug which would cause the secondary prompt to be
282 displayed when a user entered a literal carriage
283 return has been fixed.
284 b. I bug which caused ksh read -s name to core dump was
285 fixed.
286 c. I bug with the expansion of \} and \] inside double
287 quoted strings that also contained variable expansions
288 has been fixed
289 d. Changes in the 'e' point release caused autoload
290 functions invoked from within command substitution
291 to fail. This has been fixed.
292 e. A bug in the processing of here-documents that could
293 prevent variable substitution to occur after $(...) command
294 substitution for long here documents has been fixed.
295 f. A bug caused by a race condition that could cause SIGTERM
296 to be ignored by a child process has been fixed.
297 g. A bug which prevented the startup of a coprocess immediately
298 after killing a running coprocess has been fixed.
299 h. ulimit foobar, where foobar is not an arithmetic
300 expression, now gives an error message as it did with ksh88
301 instead of setting the file size limit to 0.
302 i. A bug which could cause an interactive shell to terminate when
303 the last process of a pipeline was a POSIX function was fixed.
304 j. A bug which could cause command substitution of a shell script
305 to core dump has been fixed.
306 k. A security hole was fixed in suid_exec.
307 l. Arithmetic functions such as pow() that take more than
308 one argument, did not work if arguments other than the
309 first contained parenthesized sub-expression.
310 m. The error message from a script containing an incomplete
311 arithmetic expression has been corrected.
312 n. A bug which caused a core dump on some machines when
313 the value of a name reference contained a positional
314 parameter and the name reference was not defined inside
315 a function has been fixed.
316 o. Arithmetic expressions now correctly handle hexidecimal
317 constants.
318 p. A bug in which integer variables could be expanded
319 with a leading 10# when declared with typeset -i
320 multiple times has been corrected.
321 q. A bug in which IFS wasn't correctly restored when
322 set within command substitution has been fixed.
323 r. The _ character is now considered as part of a word
324 with the M-f and M-b emacs directives as it was in ksh88.
326 13. Bugs fixed in 12/28/93g for default OPTIONS
327 a. A bug in which a name reference could be created to
328 itself and later cause the shell to get into an infinite
329 loop has been fixed.
330 b. A bug in shcomp relating to compound variables was fixed.
331 c. A bug introduced in 'e' in which leading 0's in -Z
332 fields caused the value to be treated as octal for arithmetic
333 evaluation has been fixed.
334 d. A bug when a name reference with a shorter name than
335 the variable it references was the subject of a compound
336 assignment has been fixed.
337 e. A bug which in which assignment to array variables in
338 a subshell could effect the parent shell has been
339 fixed.
340 f. read name?prompt was putting a 0 byte at the end of the
341 prompt on standard error.
342 g. A bug in [[ string1 > string2 ]] when ksh was run with -x
343 has been fixed.
344 k. A bug in which the escape character was not processed
345 correctly inside {...} when brace expansion is enabled
346 has been fixed, for example {\$foo}.
347 l. A bug in line continuation in here-documents has been
348 fixed.
349 m. The default base when not specified with typeset -i is
350 10 in accordance with the documentation. Previously,
351 the value was determined by the first assignment.
352 n. A parsing bug in which a # preceded alphanumeric
353 characters inside a command substitution caused
354 a syntax error to be reported has been fixed.
355 o. A bug in which a decimal constant represented as 10#ddd
356 where ddd was more than five digits generated a syntax
357 error has been fixed.
358 p. A bug in here document expansion in which ${...} expansions
359 were split across buffer boundaries has been fixed.
361 14. Bugs fixed in 12/28/93h for default OPTIONS
362 a. I bug in shcomp for compilation of unary operators with [[...]]
363 has been fixed.
364 b. A bug in which the value of $? was changed when executing
365 a keyboard trap has been fixed.
366 c. The handling of SIGCHLD has been changed so that the
367 trap is not triggered while executing trap commands
368 to avoid recursive trap calls.
369 d. I bug in which a local variable in a function declared readonly
370 would generated an error when the function went out of
371 scope has been fixed.
372 e. I bug in which \<new_line> entered from the keyboard
373 with the KEYBD trap enabled has been fixed.
374 f. The error message for a misplaced ((, for example print ((3),
375 was often garbled and has been fixed.
376 g. I bug in the KEYBD trap in which escape sequences of the form
377 <ESC>[#~ were not being handled as a unit has been fixed.
378 h. A bug in which ksh would consider expressions like [[ (a) ]]
379 as syntax errors has been fixed.
380 i. A function defined as foo() without a function body
381 was not reported as a syntax error.
382 j. A bug in which ksh could run out of file descriptors when
383 a stream was repeatedly opened with exec and read from
384 has been fixed.
385 k. A bug introduced when fixing item n from the 'g' point
386 release has been fixed.
388 15. Bugs fixed in 12/28/93i for default OPTIONS
389 a. A bug in which a script could terminate when getopts
390 encountered an error when invoked inside a function
391 has been fixed.
392 b. When a symbolic link was specified as the name of
393 the script to invoke by name, the value of $0 was
394 set to the real file name rather than the link name
395 in some cases and this has been fixed.
397 16. Bug fixes for specific non-default option combinations.
398 a. More signal names have been added for Solaris
399 b. A bug fixed for the v directive in vi MULTIBYTE has been
400 fixed.
401 c. Code to for IFS handling of multibyte characters has
402 been added.
403 d. The displaying of multibyte strings in export, readonly,
404 typeset, and execution traces has been fixed.
405 e. A bug with type ahead and KEYBOARD traps with the
406 MULTIBYTE option set has been fixed.
407 f. The k-shell information abstraction database option, KIA,
408 has been revamped for the 'e' point release.
409 g. A bug in brace pattern expansions that caused expressions
410 such as {foo\,bar,bam} to expand incorrectly have been fixed.
411 h. On the U/WIN version for Window 95 and Windows NT,
412 when a directory beginning with a letter followed by
413 a colon is given to cd, it is assumed to be an absolute
414 directory.
415 i. There was a bug in the compile option that does not
416 use fork() in which the current option settings where
417 not propagated to sub-shells.
418 j. A bug in setting .sh.editchar during the KEYBD trap
419 for the MULTIBYTE option was fixed in release 'h'.
420 k. A bug in which the precision given as an argument
421 to printf was not working has been fixed.
423 17. Other changes to 12/28/93[abcdefghi]
424 a. A couple of minor changes to make adding built-ins easier.
425 b. Variables inside functions are now statically scoped.
426 The previous behavior was never documented.
427 c. A few changes have been made to the name-value library
428 that affect built-ins that use disciplines. The
429 changes allow disciplines to be shared by variables
430 and should make it possible to add new disciplines
431 without recompilation.
432 d. The name-value library interface has undergone significant
433 change for this revision. See the new nval.3 man page.
434 e. Builtin functions can take a third argument which is
435 a void*.
436 f. The nv_scan() function can restrict the scope of a walk
437 to the top scope. Starting in 'f', nv_scan() has an
438 additional pointer argument that is passed to each invoked
439 function.
440 g. Starting with release 'f', an empty for list behave like
441 a for list with null expansions. It produces a warning
442 message with sh -n.
443 h. Starting with release 'f' the code has been modified to
444 work with EBCDIC as well as ASCII.
445 i. Starting with the release 'g', the name-value pair library
446 uses the cdt library rather than the hash library.
447 j. The sh_fun() function now takes third argument which
448 is an argument list for the invoked discipline function
449 or built-in.
450 k. A callback function can be installed which will give
451 notification of file duplications and file closes.
453 18. Incompatibilities with 12/28/93 version.
454 None intentional.