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A new release of bash, 3.2.25-16, has been uploaded,
replacing 3.2.17-15
as current.
NEWS:
=====
This is a minor patch release. It folds in eight new
upstream patches,
three of which are also incorporated into readline, and the
remaining
which fix: difficulty with status tracking of large numbers
of background
jobs, bad error handling when builtins fail, bad parsing of
some backslash
locations, failure to prompt correctly during read, memory
corruption when
pattern removal fails.
There are a few things you should be aware of before using
this version:
1. When using binary mounts, cygwin programs try to emulate
Linux. Bash
on Linux does not understand rn line endings, but
interprets the r
literally, which leads to syntax errors or odd variable
assignments.
Therefore, you will get the same behavior on Cygwin binary
mounts by default.
2. d2u is your friend. You can use it to convert any
problematic script
into binary line endings.
3. Cygwin text mounts automatically work with either line
ending style,
because the r is stripped before bash reads the file. If
you absolutely
must use files with rn line endings, consider mounting the
directory
where those files live as a text mount. However, text
mounts are not as
well tested or supported on the cygwin mailing list, so you
may encounter
other problems with other cygwin tools in those
directories.
4. This version of bash has a cygwin-specific shell option,
named "igncr"
to force bash to ignore r, independently of cygwin's mount
style. As of
bash-3.2.3-5, it controls regular scripts, command
substitution, and
sourced files. I hope to convince the upstream bash
maintainer to accept
this patch into the future bash 4.0 even on Linux, rather
than keeping it
a cygwin-specific patch, but only time will tell. There are
several ways
to activate this option:
4a. For a single affected script, add this line just after
the she-bang:
(set -o igncr) 2>/dev/null && set -o igncr; #
comment is needed
4b. For a single script, invoke bash explicitly with the
shopt, as in
'bash -o igncr ./myscript' rather than the simpler
'./myscript'.
4c. To affect all scripts, export the environment variable
BASH_ENV,
pointing to a file that sets the shell option as desired.
Bash will
source this file on startup for every script.
4d. Added in the bash-3.2-2 release: export the environment
variable
SHELLOPTS with igncr included in it. It is read-only from
within bash,
but you can set it before invoking bash; once in bash, it
auto-tracks the
current state of 'set -o igncr'. If exported, then all bash
child
processes inherit the same option settings; with the
exception added in
3.2.9-11 that certain interactive options are not inherited
in
non-interactive use.
5. You can also experiment with the IFS variable for
controlling how bash
will treat r during variable expansion.
6. Normally, cygwin treats DOS-style paths as binary only.
This release
of bash includes a hack to check the underlying mount point
of files, even
when passed as DOS style paths, but other cygwin tools do
not. You are
better off learning how to use POSIX-style paths.
7. There are varying levels of speed at which bash operates.
The fastest
is on a binary mount with igncr disabled (the default
behavior). Next
would be text mounts with igncr disabled and no r in the
underlying file.
Next would be binary mounts with igncr enabled. And the
slowest that bash
will operate is on text mounts with igncr enabled.
8. If you don't like how bash behaves, then propose a patch,
rather than
proposing idle ideas. This turn of events has already been
talked to
death on the mailing lists by people with many ideas, but
few patches.
9. If you forget to read this release announcement, the best
you can
expect when you complain to the list is a link back to this
email.
Remember, you must not have any bash or /bin/sh instances
running when you
upgrade the bash package. This release requires
cygwin-1.5.24-1 or
later; and it requires libreadline6-5.2.7-9. See also the
upstream
documentation in /usr/share/doc/bash-3.2.25/.
DESCRIPTION:
============
Bash is an sh-compatible shell that incorporates useful
features from the
Korn shell (ksh) and C shell (csh). It is intended to
conform to the IEEE
POSIX P1003.2/ISO 9945.2 Shell and Tools standard. It
offers functional
improvements over sh for both programming and interactive
use. In
addition, most sh scripts can be run by Bash without
modification.
As of the bash 3.0 series, cygwin /bin/sh defaults to bash,
not ash,
similar to Linux distributions.
UPDATE:
=======
To update your installation, click on the "Install
Cygwin now" link on the
http://cygwin.com/ web
page. This downloads setup.exe to your system.
Save it and run setup, answer the questions and pick up
'bash' in the
'Base' category (it should already be selected).
DOWNLOAD:
=========
Note that downloads from sources.redhat.com (aka cygwin.com)
aren't
allowed due to bandwidth limitations. This means that you
will need to
find a mirror which has this update, please choose the one
nearest to you:
http://cygwin.com/mirr
ors.html
QUESTIONS:
==========
If you want to make a point or ask a question the Cygwin
mailing list is
the appropriate place.
- --
Eric Blake
volunteer cygwin bash maintainer
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