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Fix redundancy. While here, correct usage of unix and tighten wording.

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Sponsored by: Essen Devsummit Hackathon
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Dru Lavigne 2015-07-26 08:29:38 +00:00
parent 9d8db2d90d
commit a91359e94e
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=47085
1 changed files with 20 additions and 22 deletions
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42
en_US.ISO8859-1/books/handbook/basics/chapter.xml
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@ -3178,14 +3178,14 @@ Swap: 2048M Total, 2048M Free
<para>Shell redirection is the action of sending the output or
the input of a command into another command or into a file.
To capture the output of the &man.ls.1; command, for example,
into a file, simply redirect the output:</para>
into a file, redirect the output:</para>
<screen>&prompt.user; <userinput>ls &gt; directory_listing.txt</userinput></screen>
<para>The <filename>directory_listing.txt</filename> file will
now contain the directory contents. Some commands allow you
to read input in a similar one, such as &man.sort.1;. To sort
this listing, redirect the input:</para>
<para>The directory contents will now be listed in
<filename>directory_listing.txt</filename>. Some commands can
be used to read input, such as &man.sort.1;. To sort this
listing, redirect the input:</para>
<screen>&prompt.user; <userinput>sort &lt; directory_listing.txt</userinput></screen>
@ -3196,26 +3196,24 @@ Swap: 2048M Total, 2048M Free
<screen>&prompt.user; <userinput>sort &lt; directory_listing.txt &gt; sorted.txt</userinput></screen>
<para>In all of the previous examples, the commands are
performing redirection using file descriptors. Every unix
system has file descriptors; however, here we will focus on
three, so named as Standard Input, Standard Output, and
Standard Error. Each one has a purpose, where input could be
a keyboard or a mouse, something that provides input. Output
could be a screen or paper in a printer for example. And
error would be anything that is used for diagnostic or error
messages. All three are considered <acronym>I/O</acronym>
based file descriptors and sometimes considered
streams.</para>
performing redirection using file descriptors. Every &unix;
system has file descriptors, which include standard input
(stdin), standard output (stdout), and standard error
(stderr). Each one has a purpose, where input could be a
keyboard or a mouse, something that provides input. Output
could be a screen or paper in a printer. And error would be
anything that is used for diagnostic or error messages. All
three are considered <acronym>I/O</acronym> based file
descriptors and sometimes considered streams.</para>
<para>Through the use of these descriptors, short named stdin,
stdout, and stderr, the shell allows output and input to be
passed around through various commands and redirected to or
from a file. Another method of redirection is the pipe
operator.</para>
<para>Through the use of these descriptors, the shell allows
output and input to be passed around through various commands
and redirected to or from a file. Another method of
redirection is the pipe operator.</para>
<para>The &unix; pipe operator, <quote>|</quote> allows the
output of one command to be directly passed, or directed to
another program. Basically a pipe will allow the standard
output of one command to be directly passed or directed to
another program. Basically, a pipe allows the standard
output of a command to be passed as standard input to another
command, for example:</para>