1This is a list of changes that have been made since the 12/28/93 version 2of ksh. 3 41. 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. 12 132. 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. 18 193. 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. 24 254. 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. 345. 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. 436. 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. 50 517. 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. 103 1048. 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. 144 1459. 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. 208 20910. 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. 224 22511. 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. 279 28012. 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. 325 32613. 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. 360 36114. 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. 387 38815. 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. 396 39716. 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. 422 42317. 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. 452 45318. Incompatibilities with 12/28/93 version. 454 None intentional. 455 456