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commit bash-20120831 snapshot

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Chet Ramey
2012-09-13 11:55:04 -04:00
parent df0e4bfe75
commit a7ad477fe7
58 changed files with 67921 additions and 22187 deletions
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doc/bashref.texi
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@@ -2034,6 +2034,11 @@ If @var{parameter} is @samp{*} or @samp{@@}, the value substituted
is the number of positional parameters.
If @var{parameter} is an array name subscripted by @samp{*} or @samp{@@},
the value substituted is the number of elements in the array.
If @var{parameter}
is an indexed array name subscripted by a negative number, that number is
interpreted as relative to one greater than the maximum index of
@var{parameter}, so negative indices count back from the end of the
array, and an index of -1 references the last element.
@item $@{@var{parameter}#@var{word}@}
@itemx $@{@var{parameter}##@var{word}@}
@@ -5365,6 +5370,13 @@ Note that setting @code{BASH_XTRACEFD} to 2 (the standard error file
descriptor) and then unsetting it will result in the standard error
being closed.
@item CHILD_MAX
Set the number of exited child status values for the shell to remember.
Bash will not allow this value to be decreased below a @sc{posix}-mandated
minimum, and there is a maximum value (currently 8192) that this may
not exceed.
The minimum value is system-dependent.
@item COLUMNS
Used by the @code{select} command to determine the terminal width
when printing selection lists. Automatically set by an interactive shell
@@ -6677,6 +6689,12 @@ This syntax is also accepted by the @code{declare}
builtin. Individual array elements may be assigned to using the
@code{@var{name}[@var{subscript}]=@var{value}} syntax introduced above.
When assigning to an indexed array, if @var{name}
is subscripted by a negative number, that number is
interpreted as relative to one greater than the maximum index of
@var{name}, so negative indices count back from the end of the
array, and an index of -1 references the last element.
Any element of an array may be referenced using
@code{$@{@var{name}[@var{subscript}]@}}.
The braces are required to avoid
@@ -6704,9 +6722,10 @@ Referencing an array variable without a subscript is equivalent to
referencing with a subscript of 0.
If the @var{subscript}
used to reference an element of an indexed array
evaluates to a number less than zero, it is used as
an offset from one greater than the array's maximum index (so a subcript
of -1 refers to the last element of the array).
evaluates to a number less than zero, it is
interpreted as relative to one greater than the maximum index of the array,
so negative indices count back from the end of the array,
and an index of -1 refers to the last element.
An array variable is considered set if a subscript has been assigned a
value. The null string is a valid value.
@@ -6714,6 +6733,7 @@ value. The null string is a valid value.
The @code{unset} builtin is used to destroy arrays.
@code{unset @var{name}[@var{subscript}]}
destroys the array element at index @var{subscript}.
Negative subscripts to indexed arrays are interpreted as described above.
Care must be taken to avoid unwanted side effects caused by filename
expansion.
@code{unset @var{name}}, where @var{name} is an array, removes the
@@ -7644,9 +7664,9 @@ to do them, and mail diffs or instructions to
@email{bash-maintainers@@gnu.org} so they can be
considered for the next release.
The file @file{configure.in} is used to create @code{configure}
The file @file{configure.ac} is used to create @code{configure}
by a program called Autoconf. You only need
@file{configure.in} if you want to change it or regenerate
@file{configure.ac} if you want to change it or regenerate
@code{configure} using a newer version of Autoconf. If
you do this, make sure you are using Autoconf version 2.50 or
newer.