blocks|key|1127295|text|#!/bin/bash
files=$(ls+/home/somedir/*.flac+2>+/dev/null+%7C+wc+-l)
if+[+"$files"+!=+"0"+]
then
echo+"Some+files+exists."
else
echo+"No+files+with+that+extension."
fi|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1127296|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>#!/bin/bash
files=$(ls /home/somedir/*.flac 2&gt; /dev/null | wc -l)
if [ "$files" != "0" ]
then
echo "Some files exists."
else
echo "No files with that extension."
fi
</code></pre>

blocks|key|912338|text|#!/bin/bash

count=`ls+-1+*.flac+2>/dev/null+%7C+wc+-l`
if+[+$count+!=+0+]
then+
echo+true
fi+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|912339|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>#!/bin/bash

count=`ls -1 *.flac 2&gt;/dev/null | wc -l`
if [ $count != 0 ]
then 
echo true
fi 
</code></pre>

blocks|key|912347|text|#/bin/bash

myarray=(`find+./+-maxdepth+1+-name+"*.py"`)
if+[+${#myarray[@]}+-gt+0+];+then+
++++echo+true+
else+
++++echo+false
fi|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|912348|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>#/bin/bash

myarray=(`find ./ -maxdepth 1 -name "*.py"`)
if [ ${#myarray[@]} -gt 0 ]; then 
 echo true 
else 
 echo false
fi
</code></pre>

blocks|key|1127337|text|+++shopt+-s+nullglob
+++set+--+$(echo+*.ext)
++++if+[+"${#}"+-gt+0+];then
++++++echo+"got+file"
++++fi|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1127338|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> shopt -s nullglob
 set -- $(echo *.ext)
 if [ "${#}" -gt 0 ];then
 echo "got file"
 fi
</code></pre>

blocks|key|1127363|text|仅限bash：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1127364|any_with_ext+()+(+
++++ext="$1"
++++any=false
++++shopt+-s+nullglob
++++for+f+in+*."$ext";+do
++++++++any=true
++++++++break
++++done
++++echo+$any+
)

if+$(+any_with_ext+flac+);+then
++++echo+"have+some+flac"
else+
++++echo+"dir+is+flac-free"
fi|code-block|syntax|javascript|1127365|我使用圆括号而不是大括号来确保使用子subshell+(我不想破坏您当前的nullglob设置)。|offset|length|style|CODE|1127366|entityMap^0|0|0|11|8|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

bash only:

<pre><code>any_with_ext () ( 
 ext="$1"
 any=false
 shopt -s nullglob
 for f in *."$ext"; do
 any=true
 break
 done
 echo $any 
)

if $( any_with_ext flac ); then
 echo "have some flac"
else 
 echo "dir is flac-free"
fi
</code></pre>

I use parentheses instead of braces to ensure a subshell is used (don't want to clobber your current <code>nullglob</code> setting).

blocks|key|912398|text|shopt+-s+nullglob
if+[[+-n+$(echo+*.flac)+]]++++#+or+[+-n+"$(echo+*.flac)"+]
then+
++++echo+true
fi|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|912399|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>shopt -s nullglob
if [[ -n $(echo *.flac) ]] # or [ -n "$(echo *.flac)" ]
then 
 echo true
fi
</code></pre>

blocks|key|1127404|text|这将使用ls(1)，如果不存在flac文件，ls将报告错误并退出脚本；否则，脚本将继续，文件可能会被处理|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1127405|#!+/bin/sh
ls+*.flac++>/dev/null+%7C%7C+exit
##+Do+something+with+flac+files+here|code-block|syntax|javascript|1127406|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|$]]

This uses ls(1), if no flac files exist, ls reports error and the script exits; othewise the script continues and the files may be be processed

<pre><code>#! /bin/sh
ls *.flac &gt;/dev/null || exit
## Do something with flac files here
</code></pre>

blocks|key|1127449|text|最好的解决方案(if+[+-e+*.flac+];)对我不起作用，给出了：[:+too+many+arguments|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1127450|if+ls+*.flac+>/dev/null+2>&1;，那么它就可以工作了。|1127451|entityMap^0|7|J|11|L|0|0|T|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

The top solution <code>(if [ -e *.flac ];)</code> did not work for me, giving: <code>[: too many arguments</code> 

<code>if ls *.flac &gt;/dev/null 2&gt;&amp;1;</code> then it will work.

blocks|key|1127487|text|这是一个不使用外部命令(即不使用ls)的解决方案，而是使用外壳函数。在bash中测试：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1127488|shopt+-s+nullglob
function+have_any()+{
++++[+$#+-gt+0+]
}

if+have_any+./*.flac;+then
++++echo+true
fi|code-block|syntax|javascript|1127489|函数have_any使用$#对其参数进行计数，然后[+$#+-gt+0+]测试是否至少有一个参数。在对have_any的调用中使用./*.flac而不仅仅是*.flac是为了避免像--help这样的文件名引起的问题。|1127490|entityMap^0|G|2|0|0|2|8|C|2|P|C|1F|8|1T|8|26|6|2I|6|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$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]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|N|$]]

Here is a solution using no external commands (i.e. no <code>ls</code>), but a shell function instead. Tested in bash:

<pre><code>shopt -s nullglob
function have_any() {
 [ $# -gt 0 ]
}

if have_any ./*.flac; then
 echo true
fi
</code></pre>

The function <code>have_any</code> uses <code>$#</code> to count its arguments, and <code>[ $# -gt 0 ]</code> then tests whether there is at least one argument. The use of <code>./*.flac</code> instead of just <code>*.flac</code> in the call to <code>have_any</code> is to avoid problems caused by files with names like <code>--help</code>.

blocks|key|912564|text|您可以使用-f检查是否存在特定类型的文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|912565|#!/bin/bash

if+[+-f+*.flac+]+;+then
+++echo+true
fi+|code-block|syntax|javascript|912566|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|$]]

You can use -f to check whether files of a specific type exist:

<pre><code>#!/bin/bash

if [ -f *.flac ] ; then
 echo true
fi 
</code></pre>

blocks|key|1127569|text|为了完成，请使用zsh：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1127570|if+[[+-n+*.flac(#qN)+]];+then
++echo+true
fi|code-block|syntax|javascript|1127571|这列在zsh手册的Conditional+Expressions部分的末尾。由于[[禁用文件名全局绑定，因此我们需要在全局绑定字符串的末尾使用(#q)强制生成文件名，然后使用N标志(NULL_GLOB选项)强制生成的字符串为空，以防没有匹配。|offset|length|style|CODE|1127572|entityMap|0|LINK|mutability|MUTABLE|url|http://zsh.sourceforge.net/Doc/Release/Conditional-Expressions.html^0|0|0|14|2|1Z|4|2F|1|2J|9|9|N|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]|$I|Z|J|10|K|L]|$I|11|J|12|K|L]|$I|13|J|14|K|L]]|9|@$I|15|J|16|1|17]]|A|$]]|$1|M|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

For completion, with zsh:

<pre><code>if [[ -n *.flac(#qN) ]]; then
 echo true
fi
</code></pre>

This is listed at the end of the <a href="http://zsh.sourceforge.net/Doc/Release/Conditional-Expressions.html" rel="nofollow noreferrer">Conditional Expressions</a> section in the zsh manual. Since <code>[[</code> disables filename globbing, we need to force filename generation using <code>(#q)</code> at the end of the globbing string, then the <code>N</code> flag (<code>NULL_GLOB</code> option) to force the generated string to be empty in case there’s no match.

blocks|key|1127600|text|这里有一个相当简单的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1127601|if+[+"$(ls+-A+%7C+grep+-i+\\.flac\$)"+];+then+echo+true;+fi|offset|length|style|CODE|1127602|正如您所看到的，这只是一行代码，但它工作得足够好。它应该同时适用于bash和与posix兼容shell，如dash。它也是不区分大小写的，并且不关心什么类型的文件(常规，符号链接，目录等)都存在，如果你有一些符号链接，或者别的什么，这可能会很有用。|1127603|entityMap^0|0|0|1L|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Here's a fairly simple solution:

<code>if [ "$(ls -A | grep -i \\.flac\$)" ]; then echo true; fi</code>

As you can see, this is only one line of code, but it works well enough. It should work with both bash, and a posix-compliant shell like dash. It's also case-insensitive, and doesn't care what type of files (regular, symlink, directory, etc.) are present, which could be useful if you have some symlinks, or something.

blocks|key|912684|text|我试过这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|912685|if+[+-f+*.html+];+then
++++echo+"html+files+exist"
else
++++echo+"html+files+dont+exist"
fi|code-block|syntax|javascript|912686|对于其他文件，我使用了这段代码，没有任何问题，但是对于html文件，我收到了一个error|offset|length|912687|[:+too+many+arguments|912688|然后我尝试了@JeremyWeir的计数解决方案，它对我很有效：|912689|count=`ls+-1+*.flac+2>/dev/null+%7C+wc+-l`
if+[+$count+!=+0+]
then+
echo+true
fi+|912690|请记住，如果您在循环中执行此操作，则必须重置计数：|912691|count=$((0))|912692|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/13781216/meaning-of-too-many-arguments-error-from-if-square-brackets^0|0|0|14|5|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|14|8|@]|9|@$I|15|J|16|1|17]]|A|$]]|$1|K|3|L|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|19|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|1B|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|1C|8|@]|9|@]|A|$E|F]]|$1|U|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]]]

I tried this:
<pre><code>if [ -f *.html ]; then
 echo &quot;html files exist&quot;
else
 echo &quot;html files dont exist&quot;
fi
</code></pre>
I used this piece of code without any problem for other files, but for html files I received an <a href="https://stackoverflow.com/questions/13781216/meaning-of-too-many-arguments-error-from-if-square-brackets">error</a>:
<pre><code>[: too many arguments
</code></pre>
I then tried @JeremyWeir's count solution, which worked for me:
<pre><code>count=`ls -1 *.flac 2&gt;/dev/null | wc -l`
if [ $count != 0 ]
then 
echo true
fi 
</code></pre>
Keep in mind you'll have to reset the count if you're doing this in a loop:
<pre><code>count=$((0))
</code></pre>

blocks|key|912743|text|这应该可以在任何类似于borne的shell中工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|912744|if+[+"$(find+.+-maxdepth+1+-type+f+%7C+grep+-i+'.*\.flac$')"+];+then
++++echo+true
fi|code-block|syntax|javascript|912745|这也适用于GNU，但如果它与find的其他实现兼容的话|offset|length|style|CODE|912746|if+[+"$(find+.+-maxdepth+1+-type+f+-iname+\*.flac)"+];+then
++++echo+true
fi|912747|entityMap^0|0|0|E|4|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

This should work in any borne-like shell out there:
<pre><code>if [ &quot;$(find . -maxdepth 1 -type f | grep -i '.*\.flac$')&quot; ]; then
 echo true
fi
</code></pre>
This also works with the GNU <code>find</code>, but IDK if this is compatible with other implementations of <code>find</code>:
<pre><code>if [ &quot;$(find . -maxdepth 1 -type f -iname \*.flac)&quot; ]; then
 echo true
fi
</code></pre>

How would you go about telling whether files of a specific extension are present in a directory, with bash?

Something like

<pre><code>if [ -e *.flac ]; then 
echo true; 
fi 
</code></pre>

Check whether a certain file type/extension exists in directory

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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如何使用bash来判断目录中是否存在具有特定扩展名的文件？就像这样if [ -e *.flac ]; then echo true; fi 

问检查目录中是否存在某个文件类型/扩展名
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