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author | jilles <jilles@FreeBSD.org> | 2010-10-16 14:37:56 +0000 |
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committer | jilles <jilles@FreeBSD.org> | 2010-10-16 14:37:56 +0000 |
commit | 1b1731a5575c618579523345b5817f4c82bab7f1 (patch) | |
tree | 50340858225e7a12b7ce02f9065243df511dbf98 /bin/sh | |
parent | f8700ae02e146205add34c4922a79f5507dd4594 (diff) | |
download | FreeBSD-src-1b1731a5575c618579523345b5817f4c82bab7f1.zip FreeBSD-src-1b1731a5575c618579523345b5817f4c82bab7f1.tar.gz |
sh(1): Clarify subshells/processes for pipelines.
For multi-command pipelines,
1. all commands are direct children of the shell (unlike the original
Bourne shell)
2. all commands are executed in a subshell (unlike the real Korn shell)
MFC after: 1 week
Diffstat (limited to 'bin/sh')
-rw-r--r-- | bin/sh/sh.1 | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/bin/sh/sh.1 b/bin/sh/sh.1 index 985f011..3499969 100644 --- a/bin/sh/sh.1 +++ b/bin/sh/sh.1 @@ -32,7 +32,7 @@ .\" from: @(#)sh.1 8.6 (Berkeley) 5/4/95 .\" $FreeBSD$ .\" -.Dd September 10, 2010 +.Dd October 16, 2010 .Dt SH 1 .Os .Sh NAME @@ -736,6 +736,13 @@ both of a command is considered to be assigned by the pipeline before any redirection specified by redirection operators that are part of the command. .Pp +Note that unlike some other shells, +.Nm +executes each process in a pipeline with more than one command +in a subshell environment and as a child of the +.Nm +process. +.Pp If the pipeline is not in the background (discussed later), the shell waits for all commands to complete. .Pp @@ -773,15 +780,6 @@ to be executed sequentially; an .Ql & causes asynchronous execution of the preceding AND-OR-list. -.Pp -Note that unlike some other shells, -.Nm -executes each process in the pipeline as a child of the -.Nm -process. -Shell built-in commands are the exception to this rule. -They are executed in the current shell, although they do not affect its -environment when used in pipelines. .Ss Background Commands (&) If a command is terminated by the control operator ampersand .Pq Ql & , |