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@@ -1,3 +1,388 @@ +This document details the changes between this version, bash-4.2-release, +and the previous version, bash-4.2-rc2. + +1. Changes to Bash + +a. Fixed a bug that caused some variables to be clobbered by a longjmp, + resulting in stack corruption. + +------------------------------------------------------------------------------ +This document details the changes between this version, bash-4.2-rc2, +and the previous version, bash-4.2-rc1. + +1. Changes to Bash + +a. Changes to bash_directory_completion_hook so that it's assigned to the + readline rl_directory_rewrite_hook variable, which modifies the directory + name passed to opendir without modifying the directory name the user + typed. + +b. Fixed bug in select builtin that caused it to not terminate correctly if + the read timed out due to $TMOUT. + +c. Fixed a problem that resulted in non-repeatable sequences of random + numbers when RANDOM=0. + +------------------------------------------------------------------------------ +This document details the changes between this version, bash-4.2-rc1, +and the previous version, bash-4.2-beta. + +1. Changes to Bash + +a. Fixed a bug that caused some redirection errors to leak file descriptors. + +b. Fixed a bug that caused unary `+' and `-' arithmetic operators to have a + higher precedence than unary `!' and `~'. + +c. Fixed a bug that caused simple commands in a pipeline to affect the exit + status ($?) seen by subsequent pipeline commands. + +d. A number of cygwin-specific changes to avoid the use of text-mode files + and file access, and to make sure that \r is handled correctly. + +e. Fixed a bug that caused the read builtin to not return failure if an + attempt is made to assign to a readonly variable. + +f. Fixed a bug that caused some builtin usage messages to not be translated. + +g. Fixed a bug that caused the getopts builtin to not return failure if an + attempt is made to assign to a readonly variable. Now it returns 2. + +h. Fixed the cd and pwd builtins to return failure if PWD is readonly and + cannot be assigned to. + +i. Added code to check the return value of access(2) on Solaris systems, + since it returns success for executable tests (e.g., `test -x') when + run by root, even if the file permissions don't allow execution. + +2. Changes to Readline + +a. Fixed a bug that caused directory names in words to be completed to not + be dequoted correctly. + +3. New Features in Bash + +4. New Features in Readline + +------------------------------------------------------------------------------ +This document details the changes between this version, bash-4.2-beta, +and the previous version, bash-4.2-alpha. + +1. Changes to Bash + +a. Fixed a bug that caused the \W prompt string escape to not add a closing + NULL. + +b. Fixed a bug that caused partially-quoted words that were not subject to + word splitting to retained quoted NULLs. + +c. Added considerable efficiency speedups when pattern matching in multibyte + locales by skipping multibyte character functions where possible. + +d. Added considerable speedups to variable expansion when in multibyte locales. + +e. Fixed a bug that caused the expansion of $* when there are no positional + parameters to cause the shell to dump core when used in a pattern + matching context. + +f. Fixed a bug that caused variable expansions preceding regular builtins to + not change the shell environment during their execution. + +2. Changes to Readline + +a. Fixed a bug that made an explicit argument of 0 to yank-last-arg behave + as if it were a negative argument. + +------------------------------------------------------------------------------ +This document details the changes between this version, bash-4.2-alpha, +and the previous version, bash-4.1-release. + +1. Changes to Bash + +a. Fixed a bug in the parser when processing alias expansions containing + quoted newlines. + +b. Fixed a memory leak in associative array expansion. + +c. Fixed a bug that caused quoted here-strings to be requoted when printed. + +d. Fixed a bug in arithmetic expansion that caused the index in an array + expansion to be evaluated twice under certain circumstances. + +e. Fixed several bugs with the expansion and display of variables that have + been given attributes but not values and are technically unset. + +f. Fixed a bug that caused core dumps when using filename completion that + expands to a filename containing a globbing character. + +g. Fixed a bug that caused assignment statements preceding a special builtin + when running in Posix mode to not persist after the builtin completed + when the special builtin was executed in a shell function without any + local variables. + +h. Fixed a bug that caused a command to remain in the hash table even after + `hash command' did not find anything if there was already an existing + hashed pathname. + +i. Fixed several bugs caused by executing unsafe functions from a signal + handler in the cases where a signal handler is executed immediately + rather than setting a flag for later execution. + +j. Fixed a bug that caused some internal flag variables to be set + incorrectly if `read -t' timed out. + +k. Fixed a Posix compatibility issue by making sure that a backslash escaping + a `}' within a double-quoted ${...} parameter expansion is removed as part + of the parameter expansion. + +l. Fixed a bug that caused execution of a trap to overwrite PIPESTATUS. + +m. Fixed a bug that caused here documents to not be displayed correctly + when attached to commands inside compound commands. + +n. Fixed a bug that caused the printf builtin to use the wrong precision + when using the `*' modifier. + +o. Fixed a bug that caused an arriving SIGCHLD to interrupt output functions + like those invoked by echo or printf. + +p. Changed to use a more robust mechanism than eaccess(2) when test is + checking filenames for execution permission. + +q. Fixed a bug that caused spurious semicolons to be added into the command + history in certain cases. + +r. Fixed a bug that caused the shell to free non-allocated memory when + unsetting element 0 of an associative array after it was assigned + implicitly. + +s. Fixed a bug that could cause the shell to dump core if using the `v' + vi editing command on a multi-line command. + +t. Fixed a bug that left FIFOs opened by process substitutions open long + enough to potentially cause file descriptor exhaustion when running a + shell function or shell builtin. + +u. Fixed a bug that caused the history expansion functions to not recognize + process substitution or extended glob patterns as single words. + +v. Fixed a bug that caused restricted shells to set a restricted command's + exit status incorrectly. + +w. Fixed a bug that caused bash to ignore the wrong set of filenames when + completing a command using the `complete-filename' readline command. + +x. Fixed a bug that caused a -PID argument following a -s sig or -n sig to + not be interpreted as a signal specification. + +y. Changed posix-mode behavior of a parse error in a `.' script or `eval' + command to exit the shell under Posix-specified conditions. Previous + versions printed a warning. + +z. Fixed a bug in \W prompt expansion that resulted in incorrect expansion + in the event of overlapping strings. + +aa. Fixed a bug that caused the := parameter expansion operator to return the + wrong value as the result of the expansion. + +bb. When in Posix mode, a single quote is not treated specially in a + double-quoted ${...} expansion, unless the expansion operator is + # or % or the non-Posix `//', `^', and `,'. In particular, it does + not define a new quoting context. This is from Posix interpretation 221. + +cc. Fixed a bug that inadvertently allowed program names containing slashes + to be entered into the command hash table. + +dd. Fixed a bug that caused the select builtin to incorrectly compute the + display width of the arguments in the presence of multibyte characters. + +ee. Fixed a bug that caused bash to not change the xtrace file descriptor if + BASH_XTRACEFD was found in the shell environment at startup. + +ff. Fixed a memory leak in the pattern removal parameter expansion. + +gg. Fixed a bug that caused SIGINT to fail to interrupt a nested loop if the + loop was in a pipeline. + +hh. Fixed a problem in $(...) parsing that caused the parser to add an extra + space to a here-document delimiter if the first word contained a `/'. + +ii. Fixed a bug that caused functions defined with the `function' reserved + word to require braces around the function body. + +jj. Fixed a bug that caused bash to dump core when a variable expansion being + used as an array subscript failed. + +kk. Fixed a bug that caused bash to dump core if the case-modification + expansions were used on a variable with a null value. + +ll. Fixed a bug that caused partially-quoted strings to be split incorrectly + if a variable with a null value was expanded within double quotes. + +mm. The pattern substitution word expansion has been sped up dramatically + when running in a locale with multibyte characters. + +nn. Fixed a bug that caused history -a to not write the correct lines to + the history file if all the new lines in the history list were added + since the last time the history file was read or written. + +oo. Fixed a bug that caused completion of a word with an unclosed `` command + substitution to set the prompt incorrectly. + +pp. Fixed a bug that caused extended globbing patterns in $HISTIGNORE or + $GLOBIGNORE to be incorrectly scanned. + +qq. Fixed a bug caused by closing file descriptors 3-20 on shell startup. The + shell now sets them to close-on-exec. + +rr. Fixed a bug that caused the exit status of `exec file' to be set incorrectly + if `file' was a directory. + +ss. Fixed a bug in the `.' builtin to make a non-interactive posix-mode shell + exit if the file argument to `.' is not found. Prefixing exec with + `command' makes the shell not exit. Posix requires this behavior. + +tt. Fixed a bug that caused `sh -c 'command exec; exit 1' to hang. + +uu. Fixed a bug in $(...) command substitution parsing that caused the shell + to treat backslash-newline incorrectly when parsing a comment. + +vv. Fixed bug that caused brace expansion sequence generation to misbehave + when supplied integers greater than 2**31 - 1. + +ww. Fixed a bug that caused failure to save file descriptors for redirections + to corrupt shell file descriptors. + +xx. Fixed a bug that caused bash-forward-shellword to not correctly handle + quoted strings. + +2. Changes to Readline + +a. Fixed a bug that caused the unconverted filename to be added to the list of + completions when the application specified filename conversion functions. + +b. Fixed a bug that caused the wrong filename to be passed to opendir when the + application has specified a filename dequoting function. + +c. Fixed a bug when repeating a character search in vi mode in the case where + there was no search to repeat. + +d. When show-all-if-ambiguous is set, the completion routines no longer insert + a common match prefix that is shorter than the text being completed. + +e. The full set of vi editing commands may now be used in callback mode. + +f. Fixed a bug that caused readline to not update its idea of the terminal + dimensions while running in `no-echo' mode. + +h. Fixed a bug that caused readline to dump core if an application called + rl_prep_terminal without setting rl_instream. + +i. Fixed a bug that caused meta-prefixed characters bound to incremental + search forward or backward to not be recognized if they were typed + subsequently. + +j. The incremental search code treats key sequences that map to the same + functions as (default) ^G, ^W, and ^Y as equivalent to those characters. + +k. Fixed a bug in menu-complete that caused it to misbehave with large + negative argument. + +l. Fixed a bug that caused vi-mode yank-last-arg to ring the bell when invoked + at the end of the line. + +3. New Features in Bash + +a. `exec -a foo' now sets $0 to `foo' in an executable shell script without a + leading #!. + +b. Subshells begun to execute command substitutions or run shell functions or + builtins in subshells do not reset trap strings until a new trap is + specified. This allows $(trap) to display the caller's traps and the + trap strings to persist until a new trap is set. + +c. `trap -p' will now show signals ignored at shell startup, though their + disposition still cannot be modified. + +d. $'...', echo, and printf understand \uXXXX and \UXXXXXXXX escape sequences. + +e. declare/typeset has a new `-g' option, which creates variables in the + global scope even when run in a shell function. + +f. test/[/[[ have a new -v variable unary operator, which returns success if + `variable' has been set. + +g. Posix parsing changes to allow `! time command' and multiple consecutive + instances of `!' (which toggle) and `time' (which have no cumulative + effect). + +h. Posix change to allow `time' as a command by itself to print the elapsed + user, system, and real times for the shell and its children. + +j. $((...)) is always parsed as an arithmetic expansion first, instead of as + a potential nested command substitution, as Posix requires. + +k. A new FUNCNEST variable to allow the user to control the maximum shell + function nesting (recursive execution) level. + +l. The mapfile builtin now supplies a third argument to the callback command: + the line about to be assigned to the supplied array index. + +m. The printf builtin has a new %(fmt)T specifier, which allows time values + to use strftime-like formatting. + +n. There is a new `compat41' shell option. + +o. The cd builtin has a new Posix-mandated `-e' option. + +p. Negative subscripts to indexed arrays, previously errors, now are treated + as offsets from the maximum assigned index + 1. + +q. Negative length specifications in the ${var:offset:length} expansion, + previously errors, are now treated as offsets from the end of the variable. + +r. Parsing change to allow `time -p --'. + +s. Posix-mode parsing change to not recognize `time' as a keyword if the + following token begins with a `-'. This means no more Posix-mode + `time -p'. Posix interpretation 267. + +t. There is a new `lastpipe' shell option that runs the last command of a + pipeline in the current shell context. The lastpipe option has no + effect if job control is enabled. + +u. History expansion no longer expands the `$!' variable expansion. + +v. Posix mode shells no longer exit if a variable assignment error occurs + with an assignment preceding a command that is not a special builtin. + +w. Non-interactive mode shells exit if -u is enabled and an attempt is made + to use an unset variable with the % or # expansions, the `//', `^', or + `,' expansions, or the parameter length expansion. + +x. Posix-mode shells use the argument passed to `.' as-is if a $PATH search + fails, effectively searching the current directory. Posix-2008 change. + +4. New Features in Readline + +a. The history library does not try to write the history filename in the + current directory if $HOME is unset. This closes a potential security + problem if the application does not specify a history filename. + +b. New bindable variable `completion-display-width' to set the number of + columns used when displaying completions. + +c. New bindable variable `completion-case-map' to cause case-insensitive + completion to treat `-' and `_' as identical. + +d. There are new bindable vi-mode command names to avoid readline's case- + insensitive matching not allowing them to be bound separately. + +e. New bindable variable `menu-complete-display-prefix' causes the menu + completion code to display the common prefix of the possible completions + before cycling through the list, instead of after. + +------------------------------------------------------------------------------ This document details the changes between this version, bash-4.1-rc, and the previous version, bash-4.1-beta. |