diff options
Diffstat (limited to 'CHANGES')
| -rw-r--r-- | CHANGES | 461 |
1 files changed, 461 insertions, 0 deletions
@@ -1,3 +1,464 @@ +This document details the changes between this version, bash-2.05b-release, +and the previous version, bash-2.05b-beta2. + +1. Changes to Bash + +a. Fixed an off-by-one error in the function that translates job + specifications. + +b. Note that we're running under Emacs and disable line editing if + $EMACS == `t'. + +------------------------------------------------------------------------------ +This document details the changes between this version, bash-2.05b-beta2, +and the previous version, bash-2.05b-beta1. + +1. Changes to Bash + +a. Fixed the /= and %= arithmetic operators to catch division by zero. + +b. Added putenv, setenv, unsetenv to getenv replacement for completeness. + +c. Fixed a bug that could cause the -O expand_aliases invocation option + to not take effect. + +d. Fixed a problem with process substitution that resulted in incorrect + behavior when the number of process substitutions in an individual + command approached 64. + +2. Changes to Readline + +a. Fixed a problem with backward-char-search when on a system with support + for multibyte characters when running in a locale without any multibyte + characters. + +------------------------------------------------------------------------------ +This document details the changes between this version, bash-2.05b-beta1, +and the previous version, bash-2.05b-alpha1. + +1. Changes to Bash + +a. Fixed a problem when parsing a POSIX.2 character class name while + evaluating a bracket expression containing multibyte characters. + +b. Changed the help text for `bind' to make it clear that any command + that may be placed in ~/.inputrc is a valid argument to `bind'. + +c. Added `help' builtin entries for `((', `[[', and arithmetic for. + +d. malloc updated again: + o slightly better overflow and underflow detection by putting the + chunk size at the beginning and end of the chunk and making + sure they match in free/realloc + o partial page allocated to make things page-aligned no longer + completely wasted + o block coalescing now enabled by default + o splitting and coalescing enabled for 32-byte chunks, the most + common size requested + o fixed a problem that resulted in spurious underflow messages and + aborts + o bin sizes are precomputed and stored in an array rather than + being computed at run time + o malloc will return memory blocks back to the system if the block + being freed is at the top of the heap and of sufficient size to + make it worthwhile + o malloc/free/realloc now inline memset instead of calling the + libc function; uses Duff's device for good performance + +e. Check for getservent(); make the service name completion code dependent + on its presence. + +f. Changed the readline callback that executes a command bound to a key + sequence to not save the executed command on the history list and to + save and restore the parsing state. + +g. Changes to lib/sh/snprintf.c: fixed some bugs in the `g' and `G' + floating point format display; implemented the "'" flag character + that turns on thousands' grouping; fixed behavior on systems where + MB_CUR_MAX does not evaluate to a constant. + +h. The `unset' builtin no longer returns a failure status when asked to + unset a previously-unset variable or function. + +i. Changes to the build system to make it easier to cross-compile bash + for different systems. + +j. Added `,' to the characters that are backslash-escaped during filename + completion, to avoid problems with complete-into-braces and RCS filenames + containing commas. + +k. Some changes to the multibyte character support code to avoid many calls + to strlen(). + +l. Bash now correctly honors setting LANG to some value when LC_ALL does not + already have a value. + +m. Fixed a bug that could cause SIGSEGV when processing nested traps with + trap handlers. + +n. The `source/.' builtin now restores the positional parameters when it + returns unless they were changed using the `set' builtin during the file's + execution. + +o. Fixed a bug that caused a syntax error when a command was terminated by + EOF. + +2. New Features in Bash + +a. There is now support for placing the long help text into separate files + installed into ${datadir}/bash. Not enabled by default; can be turned + on with `--enable-separate-helpfiles' option to configure. + +b. All builtins that take operands accept a `--' pseudo-option, except + `echo'. + +c. The `echo' builtin now accepts \0xxx (zero to three octal digits following + the `0') in addition to \xxx (one to three octal digits) for SUSv3/XPG6/ + POSIX.1-2001 compliance. + +3. Changes to Readline + +a. Fixed a small problem in _rl_insert_char with multibyte characters. + +b. Fixes from IBM for line wrapping problems when using multibyte characters. + +c. Fixed a problem which caused the display to be messed up when the last + line of a multi-line prompt (possibly containing invisible characters) + was longer than the screen width. + +d. Fixed a problem with the vi-mode `r' command that ocurred on systems with + support for multibyte characters when running in a locale without any + multibyte characters. + +------------------------------------------------------------------------------ +This document details the changes between this version, bash-2.05b-alpha1, +and the previous version, bash-2.05a-release. + +1. Changes to Bash + +a. Some changes to work around inlining differences between compilers. + +b. Added more prototypes for internal shell typedefs, to catch argument + passing errors when using pointers to functions. + +c. The `cd' builtin now fails in posix mode when a valid directory cannot be + constructed from a relative pathname argument and the $PWD using pathname + canonicalization, and the -P option has not been supplied. Previously, + the shell would attempt to use what the user typed, leading to weird + values for $PWD and discrepancies between the value of $PWD and the + actual working directory. + +d. The `cd' builtin now resets $PWD when canonicalization fails but a chdir + to the pathname passed as an argument succeeds (when not in posix mode). + +e. The `fc' builtin has been fixed, as POSIX requires, to use the closest + history position in range when given an out-of-range argument. + +f. The history file loading code was changed to allow lines to be saved in + the history list from the shell startup files. + +g. `history -s args' now works bettern in compound commands. + +h. The tilde expansion code was fixed to better recognize when it's being + invoked in an assignment context, which enables expansion after `=' + and `:'. + +i. Fixed the command name completion code so a slash is no longer appended + to a single match if there happens to be a directory with that name in + $PWD. + +j. Fixed compound array assignment to no longer perform alias expansion, to + allow reserved words as array members, and to not produce extra output + when the `-v' option had been enabled. + +k. Fixed the programmable completion code to better handle newlines in lists + of possible completions (e.g., `complete -W'). + +l. Removed the reserved words from the `bash-builtins' manual page. + +m. Parser error reporting now attempts to do a better job of identifying the + token in error rather than doing straight textual analysis. + +n. Fixes for Inf/NaN, locales, wide/multibyte characters and zero-length + arguments in the library snprintf(3) replacement. + +o. `read -e' no longer does command name completion on the first word on + the line being read. + +p. `select' now returns failure if the read of the user's selection fails. + +q. Fixed a bug that could cause a core dump when setting $PIPESTATUS. + +r. Fixes to not allocate so many job slots when the shell is running a loop + with job control enabled in a subshell of an interactive shell. + +s. Fixed a bug in the trap code that caused traps to be inherited by + command substitutions in some cases. + +t. Fixed a bug that could cause alias expansion to inappropriately expand + the word following the alias. + +u. Fixed a bug in the `kill' builtin that mishandled negative pid arguments. + +v. The parser is less lenient when parsing assignment statements where the + characters before the `=' don't comprise a valid identifier. + +w. The arithmetic expression evaluation code now honors the setting of the + `-u' option when expanding variable names. + +x. Fixed the arithmetic evaluation code to allow array subscripts to be + assigned (`let b[7]=42') and auto-incremented and auto-decremented + (e.g., b[7]++). + +y. Reimplemented the existing prompt string date and time expansions using + strftime(3), which changed the output of \@ in some locales. + +z. Fixed a bug that could cause a core dump when a special shell variable + (like RANDOM) was converted to an array with a variable assignment. + +aa. Fixed a bug that would reset the handler for a signal the user had + trapped to a function that would exit the shell when setting the exit + trap in a non-interactive shell. + +bb. Changed the execve(2) wrapper code to check whether or not a failing + command is a directory before looking at whether a `#!' interpreter + failed for some reason. + +cc. Fixed a bug in the command printing code so it no longer inserts a `;' + after a newline, which produces a syntax error when reused as input. + +dd. The code that expands $PS4 no longer inherits the `-x' flag. + +ee. The bash-specific completion functions may now take advantage of the + double-TAB and M-? features of the standard readline completion + functions. + +ff. The mail checking code no longer prints a message if the checked file's + size has not increased, even if the access time is less than the modification time. + +gg. Rewrote the variable symbol table code: there is now a stack of + contexts, each possibly including a separate symbol table; there can + be more than one temporary environment supplied to nested invocations + of `./source'; the temporary environments no longer require so much + special-case code; shell functions now handle the temporary environment + and local variables more consistently; function scope exit is faster now + that the entire symbol table does not have to be traversed to dispose of + local variables; it is now easier to push vars from the temporary + environment to the shell's variable table in posix mode; some duplicated + code has been removed. + +hh. Regularized the error message printing code; builtin_error is now called + more consistently, and common error message strings are handled by small + functions. This should make eventual message translation easier. + +ii. Error messages now include the line number in a script when the shell + is not interactive. + +jj. Array subscript expansion now takes place even when the array variable is + unset, so side effects will take place. + +kk. Fixed a bug in the SICGHLD child-reaping code so that it won't find + jobs already marked as terminated if the OS reuses pids quickly enough. + +ll. Fixed a bug that could cause a signal to not interrupt the `wait' + builtin while it was waiting for a background process to terminate. + +mm. A couple of changes to make it easier for multiple shells to share history + files using `history -n', `history -r', and `history -w'. + +nn. The `getopts' builtin always increments OPTIND to point to the next + option to be handled when an option is returned, whether it's valid + or not, as POSIX 1003.x-2001 requires. + +oo. Changed some parts of the expansion code to avoid allocating and + immediately freeing memory without using the results for anything. + +pp. The shell now keeps track of $IFS internally, updating its internal map + each time the variable is assigned a new value (or at local scope exit). + This saves thousands of hash lookups for IFS, which, while individually + cheap, add up. + +qq. Rewrote the hash table code: searching and insertion are much faster now, + and it uses a better string hashing function; augmented the function + interface to simplify other parts of the code and remove duplicated code + +rr. The shell now uses a simple, generic `object cache' for allocating and + caching words and word lists, which were the major users of + malloc/free. + +ss. Fixed the assignment statement parsing code to allow whitespace and + newlines in subscripts when performing array element assignment. + +tt. The shell now issues many fewer calls to sigprocmask and other signal + masking system calls. + +uu. Fixed the `test' and conditional command file comparison operators to + work right when one file has a non-positive timestamp and the other + does not exist. + +vv. Fixed some cases where the special characters '\001' and '\177' in the + values of variables or positional parameters caused incorrect expansion + results. + +2. Changes to Readline + +a. Fixed output of comment-begin character when listing variable values. + +b. Added some default key bindings for common escape sequences produced by + HOME and END keys. + +c. Fixed the mark handling code to be more emacs-compatible. + +d. A bug was fixed in the code that prints possible completions to keep it + from printing empty strings in certain circumstances. + +e. Change the key sequence printing code to print ESC as M\- if ESC is a + meta-prefix character -- it's easier for users to understand than \e. + +f. Fixed unstifle_history() to return values that match the documentation. + +g. Fixed the event loop (rl_event_hook) to handle the case where the input + file descriptor is invalidated. + +h. Fixed the prompt display code to work better when the application has a + custom redisplay function. + +i. Changes to make reading and writing the history file a little faster, and + to cope with huge history files without calling abort(3) from xmalloc. + +j. The vi-mode `S' and `s' commands are now undone correctly. + +3. New Features in Bash + +a. If set, TMOUT is the default timeout for the `read' builtin. + +b. `type' has two new options: `-f' suppresses shell function lookup, and + `-P' forces a $PATH search. + +c. New code to handle multibyte characters. + +d. `select' was changed to be more ksh-compatible, in that the menu is + reprinted each time through the loop only if REPLY is set to NULL. + The previous behavior is available as a compile-time option. + +e. `complete -d' and `complete -o dirnames' now force a slash to be + appended to names which are symlinks to directories. + +f. There is now a bindable edit-and-execute-command readline command, + like the vi-mode `v' command, bound to C-xC-e in emacs mode. + +g. Added support for ksh93-like [:word:] character class in pattern matching. + +h. The $'...' quoting construct now expands \cX to Control-X. + +i. A new \D{...} prompt expansion; passes the `...' to strftime and inserts + the result into the expanded prompt. + +j. The shell now performs arithmetic in the largest integer size the + machine supports (intmax_t), instead of long. + +k. If a numeric argument is supplied to one of the bash globbing completion + functions, a `*' is appended to the word before expansion is attempted. + +l. The bash globbing completion functions now allow completions to be listed + with double tabs or if `show-all-if-ambiguous' is set. + +m. New `-o nospace' option for `complete' and `compgen' builtins; suppresses + readline's appending a space to the completed word. + +n. New `here-string' redirection operator: <<< word. + +o. When displaying variables, function attributes and definitions are shown + separately, allowing them to be re-used as input (attempting to re-use + the old output would result in syntax errors). + +p. There is a new configuration option `--enable-mem-scramble', controls + bash malloc behavior of writing garbage characters into memory at + allocation and free time. + +q. The `complete' and `compgen' builtins now have a new `-s/-A service' + option to complete on names from /etc/services. + +r. `read' has a new `-u fd' option to read from a specified file descriptor. + +s. Fix the completion code so that expansion errors in a directory name + don't cause a longjmp back to the command loop. + +t. Fixed word completion inside command substitution to work a little more + intuitively. + +u. The `printf' %q format specifier now uses $'...' quoting to print the + argument if it contains non-printing characters. + +v. The `declare' and `typeset' builtins have a new `-t' option. When applied + to functions, it causes the DEBUG trap to be inherited by the named + function. Currently has no effect on variables. + +w. The DEBUG trap is now run *before* simple commands, ((...)) commands, + [[...]] conditional commands, and for ((...)) loops. + +x. The expansion of $LINENO inside a shell function is only relative to the + function start if the shell is interactive -- if the shell is running a + script, $LINENO expands to the line number in the script. This is as + POSIX-2001 requires. + +y. The bash debugger in examples/bashdb has been modified to work with the + new DEBUG trap semantics, the command set has been made more gdb-like, + and the changes to $LINENO make debugging functions work better. Code + from Gary Vaughan. + +z. New [n]<&word- and [n]>&word- redirections from ksh93 -- move fds (dup + and close). + +aa. There is a new `-l' invocation option, equivalent to `--login'. + +bb. The `hash' builtin has a new `-l' option to list contents in a reusable + format, and a `-d' option to remove a name from the hash table. + +4. New Features in Readline + +a. Support for key `subsequences': allows, e.g., ESC and ESC-a to both + be bound to readline functions. Now the arrow keys may be used in vi + insert mode. + +b. When listing completions, and the number of lines displayed is more than + the screen length, readline uses an internal pager to display the results. + This is controlled by the `page-completions' variable (default on). + +c. New code to handle editing and displaying multibyte characters. + +d. The behavior introduced in bash-2.05a of deciding whether or not to + append a slash to a completed name that is a symlink to a directory has + been made optional, controlled by the `mark-symlinked-directories' + variable (default is the 2.05a behavior). + +e. The `insert-comment' command now acts as a toggle if given a numeric + argument: if the first characters on the line don't specify a + comment, insert one; if they do, delete the comment text + +f. New application-settable completion variable: + rl_completion_mark_symlink_dirs, allows an application's completion + function to temporarily override the user's preference for appending + slashes to names which are symlinks to directories. + +g. New function available to application completion functions: + rl_completion_mode, to tell how the completion function was invoked + and decide which argument to supply to rl_complete_internal (to list + completions, etc.). + +h. Readline now has an overwrite mode, toggled by the `overwrite-mode' + bindable command, which could be bound to `Insert'. + +i. New application-settable completion variable: + rl_completion_suppress_append, inhibits appending of + rl_completion_append_character to completed words. + +j. New key bindings when reading an incremental search string: ^W yanks + the currently-matched word out of the current line into the search + string; ^Y yanks the rest of the current line into the search string, + DEL or ^H deletes characters from the search string. + +------------------------------------------------------------------------------ This document details the changes between this version, bash-2.05a-release, and the previous version, bash-2.05a-rc1. |