blocks|key|933507|text|您可以使用cut将行分割为空格，并仅返回第一个这样的字段：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|933508|md5=$(md5sum+"$my_iso_file"+%7C+cut+-d+'+'+-f+1)|code-block|syntax|javascript|933509|entityMap|0|LINK|mutability|MUTABLE|url|http://linux.die.net/man/1/cut^0|5|3|5|3|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

You can use <a href="http://linux.die.net/man/1/cut" rel="noreferrer"><code>cut</code></a> to split the line on spaces and return only the first such field:

<pre><code>md5=$(md5sum "$my_iso_file" | cut -d ' ' -f 1)
</code></pre>

blocks|key|933523|text|md5=`md5sum+${my_iso_file}+%7C+cut+-b-32`|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|933524|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|$]]

blocks|key|1147970|text|md5="$(md5sum+"${my_iso_file}")"
md5="${md5%25%25+*}"+#+remove+the+first+space+and+everything+after+it
echo+"${md5}"|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1147971|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>md5="$(md5sum "${my_iso_file}")"
md5="${md5%% *}" # remove the first space and everything after it
echo "${md5}"
</code></pre>

blocks|key|933541|text|另一种方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|933542|md5=$(md5sum+${my_iso_file}+%7C+sed+'/+.*//'+)|code-block|syntax|javascript|933543|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|$]]

Another way:

<pre><code>md5=$(md5sum ${my_iso_file} | sed '/ .*//' )
</code></pre>

blocks|key|933762|text|使用AWK|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|933763|md5=`md5sum+${my_iso_file}+%7C+awk+'{+print+$1+}'`|code-block|syntax|javascript|933764|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/AWK^0|2|3|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Using <a href="https://en.wikipedia.org/wiki/AWK" rel="noreferrer">AWK</a>:
<pre><code>md5=`md5sum ${my_iso_file} | awk '{ print $1 }'`
</code></pre>

blocks|key|1148201|text|md5=$(md5sum+<+index.html+%7C+head+-c+-4)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1148202|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>md5=$(md5sum &lt; index.html | head -c -4)
</code></pre>

blocks|key|1148254|text|一种方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1148255|set+--+$(md5sum+$file)
md5=$1|code-block|syntax|javascript|1148256|另一种方式：|1148257|md5=$(md5sum+$file+%7C+while+read+sum+file;+do+echo+$sum;+done)|1148258|1148259|md5=$(set+--+$(md5sum+$file);+echo+$1)|1148260|(不要尝试使用反号，除非你非常勇敢并且非常擅长使用反斜杠。)|1148261|与其他解决方案相比，这些解决方案的优势在于它们只调用md5sum和shell，而不调用awk或sed等其他程序。这是否真的重要则是一个单独的问题；您可能很难注意到其中的区别。|offset|length|style|CODE|1148262|entityMap^0|0|0|0|0|0|0|0|Q|6|17|3|1B|3|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|K|3|H|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|M|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|N|3|O|5|6|7|13|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|14|8|@$R|15|S|16|T|U]|$R|17|S|18|T|U]|$R|19|S|1A|T|U]]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|W|$]]

One way:
<pre><code>set -- $(md5sum $file)
md5=$1
</code></pre>
Another way:
<pre><code>md5=$(md5sum $file | while read sum file; do echo $sum; done)
</code></pre>
Another way:
<pre><code>md5=$(set -- $(md5sum $file); echo $1)
</code></pre>
(Do not try that with backticks unless you're very brave and very good with backslashes.)
The advantage of these solutions over other solutions is that they only invoke <code>md5sum</code> and the shell, rather than other programs such as <code>awk</code> or <code>sed</code>. Whether that actually matters is then a separate question; you'd probably be hard pressed to notice the difference.

blocks|key|1148299|text|在Mac+OS+X上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1148300|md5+-q+file|code-block|syntax|javascript|1148301|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|$]]

On Mac OS X:

<pre><code>md5 -q file
</code></pre>

blocks|key|933872|text|md5=$(md5sum+<+$file+%7C+tr+-d+'+-')|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|933873|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|$]]

blocks|key|1148354|text|一个简单的数组赋值工作...请注意，Bash数组的第一个元素可以只由name寻址，而不使用[0]索引，即$md5仅包含md5sum的32个字符。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1148355|md5=($(md5sum+file))
echo+$md5
#+53c8fdfcbb60cf8e1a1ee90601cc8fe2|code-block|syntax|javascript|1148356|entityMap|0|LINK|mutability|MUTABLE|url|http://linux.die.net/man/1/md5sum^0|Y|4|19|3|1G|4|1N|6|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

A simple array assignment works... Note that the first element of a Bash array can be addressed by just the <code>name</code> without the <code>[0]</code> index, i.e., <code>$md5</code> contains only the 32 characters of <a href="http://linux.die.net/man/1/md5sum" rel="noreferrer">md5sum</a>.
<pre><code>md5=($(md5sum file))
echo $md5
# 53c8fdfcbb60cf8e1a1ee90601cc8fe2
</code></pre>

blocks|key|1148399|text|另一种方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1148400|md5sum+filename+%7C+cut+-f+1+-d+"+"|code-block|syntax|javascript|1148401|cut会将行拆分为每个空格，并且只返回第一个字段。|offset|length|1148402|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Cut_(Unix)^0|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Another way is to do:
<pre><code>md5sum filename | cut -f 1 -d &quot; &quot;
</code></pre>
<a href="https://en.wikipedia.org/wiki/Cut_(Unix)" rel="nofollow noreferrer">cut</a> will split the line to each space and return only the first field.

blocks|key|934036|text|如果你需要打印它并且不需要换行符，你可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|934037|printf+$(md5sum+filename)|code-block|syntax|javascript|934038|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|$]]

If you need to print it and don't need a newline, you can use:

<pre><code>printf $(md5sum filename)
</code></pre>

blocks|key|934103|text|如果文件名中有反斜杠，则md5sum会在散列之前放置一个反斜杠。前32个字符或第一个空格之前的任何内容可能不是正确的哈希。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|934104|使用标准输入时不会发生这种情况(文件名将仅为-)，因此pixelbeat's+answer可以工作，但许多其他输入将需要添加像%7C+tail+-c+32这样的内容。|934105|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/3679296/only-get-hash-value-using-md5sum-without-filename/3686078#3686078^0|C|6|0|M|1|1R|C|R|I|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|H|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

<code>md5sum</code> puts a backslash before the hash if there is a backslash in the file name. The first 32 characters or anything before the first space may not be a proper hash.
It will not happen when using standard input (file name will be just <code>-</code>), so <a href="https://stackoverflow.com/questions/3679296/only-get-hash-value-using-md5sum-without-filename/3686078#3686078">pixelbeat's answer</a> will work, but many others will require adding something like <code>| tail -c 32</code>.

blocks|key|934317|text|依靠head|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|934318|md5_for_file=`md5sum+${my_iso_file}%7Chead+-c+32`|code-block|syntax|javascript|934319|entityMap^0|2|4|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

By leaning on <code>head</code>:
<pre><code>md5_for_file=`md5sum ${my_iso_file}|head -c 32`
</code></pre>

I use <a href="https://linux.die.net/man/1/md5sum" rel="noreferrer">md5sum</a> to generate a hash value for a file.
But I only need to receive the hash value, not the file name.
<pre><code>md5=`md5sum ${my_iso_file}`
echo ${md5}
</code></pre>
Output:
<pre><code>3abb17b66815bc7946cefe727737d295 ./iso/somefile.iso
</code></pre>
How can I 'strip' the file name and only retain the value?

Only get hash value using md5sum (without filename)

我使用为文件生成散列值。但我只需要接收散列值，而不是文件名。md5=`md5sum ${my_iso_file}`echo ${md5}输出：3abb17b66815bc7946cefe727737d295  ./iso/somefile.iso如何“剥离”文件名并只保留其值？

问仅使用md5sum获取哈希值(不带文件名)
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