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updates for nofork command substitution; changes for z/OS machines; fix for race in wait_for_any_job

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Chet Ramey
2023-05-22 09:37:41 -04:00
parent e44e3d50de
commit 782af56204
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@@ -4510,19 +4510,16 @@ There is an alternate form of command substitution:
<DL COMPACT><DT><DD>
<P>
<B>${</B><I>C</I> <I>command</I><B>;</B><B>}</B>
<B>${</B><I>c</I> <I>command</I><B>;</B><B>}</B>
</DL>
<P>
which executes <I>command</I> in the current execution environment.
This means that side effects of <I>command</I> take effect immediately
in the current execution environment and persist in the current
environment after the command completes (e.g., the <B>exit</B> builtin
will exit the shell).
which executes <I>command</I> in the current execution environment
and captures its output, again with trailing newlines removed.
<P>
The character <I>C</I> following the open brace must be a space, tab,
The character <I>c</I> following the open brace must be a space, tab,
newline, <B>(</B>, or <B>|</B>, and the close brace must be in a position
where a reserved word may appear (i.e., preceded by a command terminator
such as semicolon).
@@ -4531,6 +4528,12 @@ the word without being followed by a shell metacharacter as a reserved
word would usually require.
<P>
Any side effects of <I>command</I> take effect immediately
in the current execution environment and persist in the current
environment after the command completes (e.g., the <B>exit</B> builtin
will exit the shell).
<P>
This type of command substitution superficially resembles executing an
unnamed shell function: local variables are created as when a shell
function is executing, and the <B>return</B> builtin forces
@@ -11192,6 +11195,8 @@ is supplied with a
<I>name</I>
that is not a function.
<DT><B>false</B><DD>
Does nothing, returns a non-zero status.
<DT><B>fc</B> [<B>-e</B> <I>ename</I>] [<B>-lnr</B>] [<I>first</I>] [<I>last</I>]<DD>
<DT><B>fc</B> <B>-s</B> [<I>pat</I>=<I>rep</I>] [<I>cmd</I>]<DD>
@@ -13993,6 +13998,8 @@ is invalid; otherwise
<B>trap</B>
returns true.
<DT><B>true</B><DD>
Does nothing, returns a 0 status.
<DT><B>type</B> [<B>-aftpP</B>] <I>name</I> [<I>name</I> ...]<DD>
With no options,
indicate how each
@@ -15101,7 +15108,7 @@ There may be only one active coprocess at a time.
<DT><A HREF="#lbDI">BUGS</A><DD>
</DL>
<HR>
This document was created by man2html from /usr/local/src/bash/bash-20230509/doc/bash.1.<BR>
Time: 14 May 2023 15:37:14 EDT
This document was created by man2html from /usr/local/src/bash/bash-20230515/doc/bash.1.<BR>
Time: 20 May 2023 11:02:33 EDT
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</HTML>