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Chet Ramey
2015-11-02 10:49:23 -05:00
parent 33723c8402
commit 07357ec296
64 changed files with 6405 additions and 8823 deletions
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doc/bashref.texi
+13 -9
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@@ -14,7 +14,7 @@ This is Edition @value{EDITION}, last updated @value{UPDATED},
of @cite{The GNU Bash Reference Manual},
for @code{Bash}, Version @value{VERSION}.
Copyright @copyright{} 1988--2014 Free Software Foundation, Inc.
Copyright @copyright{} 1988--2015 Free Software Foundation, Inc.
@quotation
Permission is granted to copy, distribute and/or modify this document
@@ -2246,8 +2246,8 @@ or
@end example
@noindent
Bash performs the expansion by executing @var{command} and
replacing the command substitution with the standard output of the
Bash performs the expansion by executing @var{command} in a subshell environment
and replacing the command substitution with the standard output of the
command, with any trailing newlines deleted.
Embedded newlines are not deleted, but they may be removed during
word splitting.
@@ -2296,8 +2296,8 @@ failure to the standard error and no substitution occurs.
@subsection Process Substitution
@cindex process substitution
Process substitution is supported on systems that support named
pipes (@sc{fifo}s) or the @file{/dev/fd} method of naming open files.
Process substitution allows a process's input or output to be
referred to using a filename.
It takes the form of
@example
<(@var{list})
@@ -2308,16 +2308,20 @@ or
>(@var{list})
@end example
@noindent
The process @var{list} is run with its input or output connected to a
@sc{fifo} or some file in @file{/dev/fd}. The name of this file is
The process @var{list} is run asynchronously, and its input or output
appears as a filename.
This filename is
passed as an argument to the current command as the result of the
expansion. If the @code{>(@var{list})} form is used, writing to
expansion.
If the @code{>(@var{list})} form is used, writing to
the file will provide input for @var{list}. If the
@code{<(@var{list})} form is used, the file passed as an
argument should be read to obtain the output of @var{list}.
Note that no space may appear between the @code{<} or @code{>}
and the left parenthesis, otherwise the construct would be interpreted
as a redirection.
Process substitution is supported on systems that support named
pipes (@sc{fifo}s) or the @file{/dev/fd} method of naming open files.
When available, process substitution is performed simultaneously with
parameter and variable expansion, command substitution, and arithmetic
@@ -2341,7 +2345,7 @@ at the beginning and end of the results of the previous
expansions are ignored, and any sequence of @env{IFS}
characters not at the beginning or end serves to delimit words.
If @env{IFS} has a value other than the default, then sequences of
the whitespace characters @code{space} and @code{tab}
the whitespace characters @code{space}, @code{tab}, and @code{newline}
are ignored at the beginning and end of the
word, as long as the whitespace character is in the
value of @env{IFS} (an @env{IFS} whitespace character).