Imported from ../bash-3.0.tar.gz.
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Jari Aalto
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194
NEWS
194
NEWS
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This is a terse description of the new features added to bash-3.0 since
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the release of bash-2.05b. As always, the manual page (doc/bash.1) is
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the place to look for complete descriptions.
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1. New Features in Bash
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a. ANSI string expansion now implements the \x{hexdigits} escape.
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b. There is a new loadable `strftime' builtin.
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c. New variable, COMP_WORDBREAKS, which controls the readline completer's
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idea of word break characters.
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d. The `type' builtin no longer reports on aliases unless alias expansion
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will actually be performed.
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e. HISTCONTROL is now a colon-separated list of values, which permits
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more extensibility and backwards compatibility.
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f. HISTCONTROL may now include the `erasedups' option, which causes all lines
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matching a line being added to be removed from the history list.
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g. `configure' has a new `--enable-multibyte' argument that permits multibyte
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character support to be disabled even on systems that support it.
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h. New variables to support the bash debugger: BASH_ARGC, BASH_ARGV,
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BASH_SOURCE, BASH_LINENO, BASH_SUBSHELL, BASH_EXECUTION_STRING,
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BASH_COMMAND
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i. FUNCNAME has been changed to support the debugger: it's now an array
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variable.
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j. for, case, select, arithmetic commands now keep line number information
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for the debugger.
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k. There is a new `RETURN' trap executed when a function or sourced script
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returns (not inherited child processes; inherited by command substitution
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if function tracing is enabled and the debugger is active).
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l. New invocation option: --debugger. Enables debugging and turns on new
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`extdebug' shell option.
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m. New `functrace' and `errtrace' options to `set -o' cause DEBUG and ERR
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traps, respectively, to be inherited by shell functions. Equivalent to
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`set -T' and `set -E' respectively. The `functrace' option also controls
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whether or not the DEBUG trap is inherited by sourced scripts.
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n. The DEBUG trap is run before binding the variable and running the action
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list in a `for' command, binding the selection variable and running the
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query in a `select' command, and before attempting a match in a `case'
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command.
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o. New `--enable-debugger' option to `configure' to compile in the debugger
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support code.
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p. `declare -F' now prints out extra line number and source file information
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if the `extdebug' option is set.
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q. If `extdebug' is enabled, a non-zero return value from a DEBUG trap causes
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the next command to be skipped, and a return value of 2 while in a
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function or sourced script forces a `return'.
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r. New `caller' builtin to provide a call stack for the bash debugger.
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s. The DEBUG trap is run just before the first command in a function body is
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executed, for the debugger.
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t. `for', `select', and `case' command heads are printed when `set -x' is
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enabled.
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u. There is a new {x..y} brace expansion, which is shorthand for {x.x+1,
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x+2,...,y}. x and y can be integers or single characters; the sequence
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may ascend or descend; the increment is always 1.
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v. New ksh93-like ${!array[@]} expansion, expands to all the keys (indices)
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of array.
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w. New `force_fignore' shopt option; if enabled, suffixes specified by
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FIGNORE cause words to be ignored when performing word completion even
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if they're the only possibilities.
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x. New `gnu_errfmt' shopt option; if enabled, error messages follow the `gnu
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style' (filename:lineno:message) format.
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y. New `-o bashdefault' option to complete and compgen; if set, causes the
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whole set of bash completions to be performed if the compspec doesn't
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result in a match.
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z. New `-o plusdirs' option to complete and compgen; if set, causes directory
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name completion to be performed and the results added to the rest of the
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possible completions.
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aa. `kill' is available as a builtin even when the shell is built without
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job control.
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bb. New HISTTIMEFORMAT variable; value is a format string to pass to
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strftime(3). If set and not null, the `history' builtin prints out
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timestamp information according to the specified format when displaying
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history entries. If set, bash tells the history library to write out
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timestamp information when the history file is written.
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cc. The [[ ... ]] command has a new binary `=~' operator that performs
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extended regular expression (egrep-like) matching.
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dd. `configure' has a new `--enable-cond-regexp' option (enabled by default)
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to enable the =~ operator and regexp matching in [[ ... ]].
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ee. Subexpressions matched by the =~ operator are placed in the new
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BASH_REMATCH array variable.
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ff. New `failglob' option that causes an expansion error when pathname
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expansion fails to produce a match.
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gg. New `set -o pipefail' option that causes a pipeline to return a failure
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status if any of the processes in the pipeline fail, not just the last
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one.
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hh. printf builtin understands two new escape sequences: \" and \?.
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ii. `echo -e' understands two new escape sequences: \" and \?.
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jj. The GNU `gettext' package and libintl have been integrated; the shell's
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messages can be translated into different languages.
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kk. The `\W' prompt expansion now abbreviates $HOME as `~', like `\w'.
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ll. The error message printed when bash cannot open a shell script supplied
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as argument 1 now includes the name of the shell, to better identify
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the error as coming from bash.
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mm. The parameter pattern removal and substitution expansions are now much
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faster and more efficient when using multibyte characters.
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nn. The `jobs', `kill', and `wait' builtins now accept job control notation
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even if job control is not enabled.
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oo. The historical behavior of `trap' that allows a missing `action' argument
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to cause each specified signal's handling to be reset to its default is
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now only supported when `trap' is given a single non-option argument.
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2. New Features in Readline
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a. History expansion has a new `a' modifier equivalent to the `g' modifier
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for compatibility with the BSD csh.
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b. History expansion has a new `G' modifier equivalent to the BSD csh `g'
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modifier, which performs a substitution once per word.
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c. All non-incremental search operations may now undo the operation of
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replacing the current line with the history line.
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d. The text inserted by an `a' command in vi mode can be reinserted with
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`.'.
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e. New bindable variable, `show-all-if-unmodified'. If set, the readline
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completer will list possible completions immediately if there is more
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than one completion and partial completion cannot be performed.
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f. There is a new application-callable `free_history_entry()' function.
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g. History list entries now contain timestamp information; the history file
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functions know how to read and write timestamp information associated
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with each entry.
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h. Four new key binding functions have been added:
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rl_bind_key_if_unbound()
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rl_bind_key_if_unbound_in_map()
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rl_bind_keyseq_if_unbound()
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rl_bind_keyseq_if_unbound_in_map()
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i. New application variable, rl_completion_quote_character, set to any
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quote character readline finds before it calls the application completion
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function.
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j. New application variable, rl_completion_suppress_quote, settable by an
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application completion function. If set to non-zero, readline does not
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attempt to append a closing quote to a completed word.
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k. New application variable, rl_completion_found_quote, set to a non-zero
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value if readline determines that the word to be completed is quoted.
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Set before readline calls any application completion function.
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l. New function hook, rl_completion_word_break_hook, called when readline
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needs to break a line into words when completion is attempted. Allows
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the word break characters to vary based on position in the line.
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m. New bindable command: unix-filename-rubout. Does the same thing as
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unix-word-rubout, but adds `/' to the set of word delimiters.
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n. When listing completions, directories have a `/' appended if the
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`mark-directories' option has been enabled.
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-------------------------------------------------------------------------------
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This is a terse description of the new features added to bash-2.05b since
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the release of bash-2.05a. As always, the manual page (doc/bash.1) is
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the place to look for complete descriptions.
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|
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