blocks|key|1551911|text|while+read+name+value
do
++if+[+$name+=+banned-phrase+]
++then
++++echo+$value+>>+bannedphraselist
++elif+[+$name+=+banned-site+]
++then
++++echo+$value+>>+bannedsitelist
++fi
done+<+dansguardian-config|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1551912|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>while read name value
do
 if [ $name = banned-phrase ]
 then
 echo $value &gt;&gt; bannedphraselist
 elif [ $name = banned-site ]
 then
 echo $value &gt;&gt; bannedsitelist
 fi
done &lt; dansguardian-config
</code></pre>

blocks|key|3579160|text|你可以这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3579161|sed+-n+'s/%5Ebanned-phrase+*//p'+dansguardian-config+>+bannedphraselist
sed+-n+'s/%5Ebanned-site+*//p'+dansguardian-config+>+bannedsitelist|code-block|syntax|javascript|3579162|尽管这意味着要读取该文件两次。不过，我怀疑可能的性能损失是否重要。|3579163|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You could do

<pre><code>sed -n 's/^banned-phrase *//p' dansguardian-config &gt; bannedphraselist
sed -n 's/^banned-site *//p' dansguardian-config &gt; bannedsitelist
</code></pre>

Although that means reading the file twice. I doubt that the possible performance loss matters though.

blocks|key|1456830|text|您可以一次读取多个变量；默认情况下，它们以空格分隔。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1456831|while+read+command+target;+do
++case+"$command"+in
++++banned-phrase)+echo+"$target"+>>bannedphraselist;;
++++banned-site)+echo+"$target"+>>bannedsitelist;;
++++"")+;;+#+blank+line
++++*)+echo+>&2+"$0:+unrecognized+config+directive+'$command'";;
++esac
done+<+dansguardian-config|code-block|syntax|javascript|1456832|只是作为一个例子。更聪明的实现应该是先读取列表文件，确保没有被禁止，等等。|1456833|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can read multiple variables at once; by default they're split on whitespace.

<pre><code>while read command target; do
 case "$command" in
 banned-phrase) echo "$target" &gt;&gt;bannedphraselist;;
 banned-site) echo "$target" &gt;&gt;bannedsitelist;;
 "") ;; # blank line
 *) echo &gt;&amp;2 "$0: unrecognized config directive '$command'";;
 esac
done &lt; dansguardian-config
</code></pre>

Just as an example. A smarter implementation would read the list files first, make sure things weren't already banned, etc.

blocks|key|410197|text|最好使用awk：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|410198|awk+'$1+~+/%5Ebanned-phrase/{print+$2+>>+"bannedphraselist"}
+++++$1+~+/%5Ebanned-site/{print+$2+>>+"bannedsitelist"}'+dansguardian-config|code-block|syntax|javascript|410199|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Better to use awk:

<pre><code>awk '$1 ~ /^banned-phrase/{print $2 &gt;&gt; "bannedphraselist"}
 $1 ~ /^banned-site/{print $2 &gt;&gt; "bannedsitelist"}' dansguardian-config
</code></pre>

blocks|key|1552007|text|使用echo+text+>>+file的所有解决方案有什么问题？可以用strace检查，在每个这样的步骤中，打开file，然后定位到最后，然后写入text并关闭文件。所以如果有1000次echo+text+>>+file，那么就会有1000次open，lseek，write，close。可以通过以下方式大幅减少open、lseek和close的数量：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1552008|while+read+key+val;+do
++case+$key+in
++banned-phrase)+echo+$val>&2;;
++banned-site)+echo+$val;;
++esac
done+>bannedsitelist+2>bannedphraselist+<dansguardian-config|code-block|syntax|javascript|1552009|stdout和stderr被重定向到文件，并在循环活动时保持打开状态。因此，文件只打开一次，然后关闭一次。不需要我的帮助。此外，这种方式更多地使用了文件缓存，因为对close的不必要调用不会每次都刷新缓冲区。|1552010|entityMap^0|2|H|Z|6|1K|4|21|4|2L|H|3D|4|3I|5|3O|5|3U|5|4C|4|4H|5|4N|5|0|0|2A|5|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|N|$]]

What is the problem with all the solutions which uses <code>echo text &gt;&gt; file</code>? It can be checked with <code>strace</code> that in every such step the <code>file</code> is opened, then positioned to the end, then <code>text</code> is written and file is closed. So if there is 1000 times <code>echo text &gt;&gt; file</code> then there will be 1000 <code>open</code>, <code>lseek</code>, <code>write</code>, <code>close</code>. The number of <code>open</code>, <code>lseek</code> and <code>close</code> can be reduced a lot on the following way:

<pre><code>while read key val; do
 case $key in
 banned-phrase) echo $val&gt;&amp;2;;
 banned-site) echo $val;;
 esac
done &gt;bannedsitelist 2&gt;bannedphraselist &lt;dansguardian-config
</code></pre>

The stdout and stderr is redirected to files and kept open while the loop is alive. So the files are opened once and closed once. No need of lseek. Also the file caching is used more in this way as the unnecessary calls to <code>close</code> will not flush the buffers each time.

Here's my config file (dansguardian-config):

<pre><code>banned-phrase duck

banned-site allaboutbirds.org
</code></pre>

I want to write a bash script that will read this config file and create some other files for me. Here's what I have so far, it's mostly pseudo-code:

<pre><code>while read line
do
 # if line starts with "banned-phrase"
 # add rest of line to file bannedphraselist
 # fi

 # if line starts with "banned-site"
 # add rest of line to file bannedsitelist
 # fi
done &lt; dansguardian-config
</code></pre>

I'm not sure if I need to use grep, sed, awk, or what.

Hope that makes sense. I just really hate DansGuardian lists.

Parsing a config file in bash

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这是我的配置文件(dansguardian- config )：banned-phrase duckbanned-site allaboutbirds.org我想写一个bash脚本，它将读取此配置文件并为我创建一些其他文件。这是我到目前为止所知道的，大部分都是伪代码：while read linedo    # if ...

问在bash中解析配置文件
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