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Bash-4.2 distribution sources and documentation

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Chet Ramey 2011-11-22 19:11:26 -05:00
commit 495aee441b
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48
COMPAT
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@ -295,7 +295,8 @@ version and versions 2.0 and above.
37. Bash-4.0 now allows SIGCHLD to interrupt the wait builtin, as Posix
specifies, so the SIGCHLD trap is no longer always invoked once per
exiting child if you are using `wait' to wait for all children.
exiting child if you are using `wait' to wait for all children. As
of bash-4.2, this is the status quo only when in posix mode.
38. Since bash-4.0 now follows Posix rules for finding the closing delimiter
of a $() command substitution, it will not behave as previous versions
@ -330,35 +331,58 @@ version and versions 2.0 and above.
44. Bash-4.1 uses the current locale when comparing strings using the < and
> operators to the `[[' command. This can be reverted to the previous
behavior by setting one of the `compatNN' shopt options.
behavior (ASCII collating and strcmp(3)) by setting one of the
`compatNN' shopt options, where NN is less than 41.
45. Command substitutions now remove the caller's trap strings when trap is
run to set a new trap in the subshell. Previous to bash-4.2, the old
trap strings persisted even though the actual signal handlers were reset.
46. When in Posix mode, a single quote is not treated specially in a
double-quoted ${...} expansion, unless the expansion operator is
# or % or the new `//', `^', or `,' expansions. In particular, it
does not define a new quoting context. This is from Posix interpretation
221.
47. Posix mode shells no longer exit if a variable assignment error occurs
with an assignment preceding a command that is not a special builtin.
Shell Compatibility Level
=========================
Bash-4.0 introduced the concept of a `shell compatibility level', specified
as a set of options to the shopt builtin (compat31, compat32, compat40 at
this writing). There is only one current compatibility level -- each
option is mutually exclusive. This list does not mention behavior that is
standard for a particular version (e.g., setting compat32 means that quoting
the rhs of the regexp matching operator quotes special regexp characters in
the word, which is default behavior in bash-3.2 and above).
as a set of options to the shopt builtin (compat31, compat32, compat40, and
compat41 at this writing). There is only one current compatibility level --
each option is mutually exclusive. This list does not mention behavior
that is standard for a particular version (e.g., setting compat32 means that
quoting the rhs of the regexp matching operator quotes special regexp
characters in the word, which is default behavior in bash-3.2 and above).
compat31 set
- the < and > operators to the [[ command do not consider the current
locale when comparing strings
locale when comparing strings; they use ASCII ordering
- quoting the rhs of the regexp matching operator (=~) has no
special effect
compat32 set
- the < and > operators to the [[ command do not consider the current
locale when comparing strings
locale when comparing strings; they use ASCII ordering
compat40 set
- the < and > operators to the [[ command do not consider the current
locale when comparing strings
locale when comparing strings; they use ASCII ordering
- interrupting a command list such as "a ; b ; c" causes the execution
of the entire list to be aborted
of the entire list to be aborted (in versions before bash-4.0,
interrupting one command in a list caused the next to be executed)
compat41 set
- interrupting a command list such as "a ; b ; c" causes the execution
of the entire list to be aborted (in versions before bash-4.0,
interrupting one command in a list caused the next to be executed)
- when in posix mode, single quotes in the `word' portion of a
double-quoted parameter expansion define a new quoting context and
are treated specially
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