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Here are some of them, excerpted from NEWS:
- New code to handle multibyte characters.
- `select' was changed to be more ksh-compatible
- 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.
- The shell now performs arithmetic in the largest integer size the
machine supports (intmax_t), instead of long.
- There is a new configuration option `--enable-mem-scramble', controls
bash malloc behavior of writing garbage characters into memory at
allocation and free time.
- The `complete' and `compgen' builtins now have a new `-s/-A service'
option to complete on names from /etc/services.
- `read' has a new `-u fd' option to read from a specified file descriptor.
- 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.
- 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.
- New [n]<&word- and [n]>&word- redirections from ksh93 -- move fds (dup
and close).
- 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.
- Added support for DESTDIR installation root prefix, so you can do a
`make install DESTDIR=bash-root' and do easier binary packaging.
- New `-A group/-g' option to complete and compgen; does group name
completion.
- The ksh-like `ERR' trap has been added. The `ERR' trap will be run
whenever the shell would have exited if the -e option were enabled.
It is not inherited by shell functions.
- configure has a new `--enable-largefile' option, like other GNU utilities.
- `for' loops now allow empty word lists after `in', like the latest POSIX
drafts require.
- The builtin `ulimit' now takes two new non-numeric arguments: `hard',
meaning the current hard limit, and `soft', meaning the current soft
limit, in addition to `unlimited'
Also, there is a "New unwind-protect implementation from Paul
Eggert", which I believe obviates the need for two sparc64-related
patches.
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