blocks|key|3027023|text|GNU+Coreutils包含一个名为numfmt的小工具，用于进行数字转换，这显然不为人所知，它可以做您需要的事情：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3027024|$+numfmt+--to=iec-i+--suffix=B+--format="%25.3f"+4953205820
4.614GiB|code-block|syntax|javascript|3027025|我认为这很适合你的需求，而且不像其他答案那样庞大或老套。|3027026|如果你想要一个更强大的解决方案，请看我的另一个答案。|3027027|entityMap|0|LINK|mutability|MUTABLE|url|https://www.gnu.org/software/coreutils/|1|http://www.gnu.org/software/coreutils/manual/html_node/numfmt-invocation.html#numfmt-invocation^0|J|6|0|D|0|J|6|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]|$9|14|A|15|1|16]]|E|$]]|$1|F|3|G|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|18|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|19|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

<a href="https://www.gnu.org/software/coreutils/" rel="noreferrer">GNU Coreutils</a> contains an apparently rather unknown little tool called <a href="http://www.gnu.org/software/coreutils/manual/html_node/numfmt-invocation.html#numfmt-invocation" rel="noreferrer"><code>numfmt</code></a> for numeric conversion, that does what you need:

<pre><code>$ numfmt --to=iec-i --suffix=B --format="%.3f" 4953205820
4.614GiB
</code></pre>

I think that suits your needs well, and isn’t as large or hackish as the other answers.

If you want a more powerful solution, look at my other answer.

blocks|key|2814374|text|有没有什么原因让你不使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2814375|ls+-lh|code-block|syntax|javascript|2814376|司令部？如果您使用的是最近几年发布的Linux系统，则可以使用此功能。|2814377|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|$]]

Is there any reason you are not using 

<pre><code>ls -lh
</code></pre>

command ? If you are on a Linux system which has been released in the last few years, you have this functionality.

blocks|key|191850|text|ls+-lah+/path/to/your/file+%7C+awk+-F+"+"+{'print+$5'}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|191851|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>ls -lah /path/to/your/file | awk -F " " {'print $5'}
</code></pre>

blocks|key|3027047|text|我知道现在有点晚了。但也许有人会发现它很有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3027048|答案很简单，在脚本中使用%25.2f而不是%25.3g。(src)|offset|length|style|CODE|3027049|3027050|测试：|3027051|#!/bin/bash

size=1883954

if+[+$size+-ge+1048576+]
then
++++size=$(awk+'BEGIN+{printf+"%25.2f",'$size'/1048576}')M
elif+[+$size+-ge+1024+]
then
++++size=$(awk+'BEGIN+{printf+"%25.2f",'$size'/1024}')K
fi

echo+$size|code-block|syntax|javascript|3027052|输出：|3027053|1.80M|3027054|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2395284/round-a-divided-number-in-bash^0|0|C|4|J|4|P|3|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@$D|13|E|14|F|G]|$D|15|E|16|F|G]]|9|@$D|17|E|18|1|19]]|A|$]]|$1|H|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1C|8|@]|9|@]|A|$N|O]]|$1|P|3|Q|5|6|7|1D|8|@]|9|@]|A|$]]|$1|R|3|S|5|M|7|1E|8|@]|9|@]|A|$N|O]]|$1|T|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

I know that it's a little late. But may someone find it useful.

The answer is, simply, to use <code>%.2f</code> instead of <code>%.3g</code> in your script. (<a href="https://stackoverflow.com/questions/2395284/round-a-divided-number-in-bash">src</a>)

<hr>

Test:

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

size=1883954

if [ $size -ge 1048576 ]
then
 size=$(awk 'BEGIN {printf "%.2f",'$size'/1048576}')M
elif [ $size -ge 1024 ]
then
 size=$(awk 'BEGIN {printf "%.2f",'$size'/1024}')K
fi

echo $size
</code></pre>

The Output:

<pre><code>1.80M
</code></pre>

blocks|key|3027091|text|使用stat+-c+%25s+filename.ext而不是使用ls和awk来获取文件大小。它只输出数字，不输出其他内容(至少在8.21版本中)。我不能使用numfmt，因为它是一个较旧的版本，似乎没有使用小数精度的printf语法。我改用下面的脚本。我使用最后一行来测试脚本是否源码。如果不是，我可以直接在命令行上调用它。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3027092|#!/bin/bash

function+getFriendlyFileSize()+{
++++OUT='/dev/null'
++++[+"$#"+==+0+]+&&+echo+'No+number+given'+&&+return+1
++++[+!+$(echo+$1+%7C+egrep+-i+'\-?[0-9]%2B')+]+&&+echo+'Garbage+data'+&&+return+1

++++if+[+"$1"+==+''+-o+"$1"+-lt+0+]+2>$OUT
++++then
++++++++++++echo+'0+B'
++++++++++++return+1
++++else
++++++++++++FSIZE=$1
++++fi

++++[+"$2"+==+''+]+&&+DECPTS=1+%7C%7C+DECPTS=$2

++++KB=1024
++++MB=1048576
++++GB=1073741824
++++TB=1099511627776
++++PB=1125899906842624
++++EB=1152921504606846976
++++LM=9223372036854775807+#+bash+comparison+limit+=+2%5E63-1+(signed+int?)

++++[+"$FSIZE"+-le+0+]+2>$OUT+&&+echo+"0+B"+&&+return
++++[+"$FSIZE"+-lt+$KB+]+2>$OUT+&&+echo+"$FSIZE+B"+&&+return
++++[+"$FSIZE"+-lt+$MB+]+2>$OUT+&&+echo+"$(echo+"scale=$DECPTS;$FSIZE/$KB"%7Cbc)+KB"+&&+return
++++[+"$FSIZE"+-lt+$GB+]+2>$OUT+&&+echo+"$(echo+"scale=$DECPTS;$FSIZE/$MB"%7Cbc)+MB"+&&+return
++++[+"$FSIZE"+-lt+$TB+]+2>$OUT+&&+echo+"$(echo+"scale=$DECPTS;$FSIZE/$GB"%7Cbc)+GB"+&&+return
++++[+"$FSIZE"+-lt+$PB+]+2>$OUT+&&+echo+"$(echo+"scale=$DECPTS;$FSIZE/$TB"%7Cbc)+TB"+&&+return
++++[+"$FSIZE"+-lt+$EB+]+2>$OUT+&&+echo+"$(echo+"scale=$DECPTS;$FSIZE/$PB"%7Cbc)+PB"+&&+return
++++[+"$FSIZE"+-le+$LM+]+2>$OUT+&&+echo+"$(echo+"scale=$DECPTS;$FSIZE/$EB"%7Cbc)+EB"+&&+return
++++[+"$?"+-ne+'0'+]+2>$OUT+&&+echo+"Bad+input"+&&+return+1
}

[[+$_+==+$0+]]+&&+getFriendlyFileSize+$1+$2|code-block|syntax|javascript|3027093|entityMap^0|2|N|U|2|X|3|24|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|L|$]]

Instead of using <code>ls</code> and <code>awk</code> to get the file size, use <code>stat -c %s filename.ext</code>. It outputs only the number, with nothing else (at least on version 8.21). I can't use <code>numfmt</code> because it's an older version which doesn't appear to use the printf syntax with decimal precision. I instead use the script below. I use the last line to test if the script is being sourced. If it's not, I can call it directly on the command line.

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

function getFriendlyFileSize() {
 OUT='/dev/null'
 [ "$#" == 0 ] &amp;&amp; echo 'No number given' &amp;&amp; return 1
 [ ! $(echo $1 | egrep -i '\-?[0-9]+') ] &amp;&amp; echo 'Garbage data' &amp;&amp; return 1

 if [ "$1" == '' -o "$1" -lt 0 ] 2&gt;$OUT
 then
 echo '0 B'
 return 1
 else
 FSIZE=$1
 fi

 [ "$2" == '' ] &amp;&amp; DECPTS=1 || DECPTS=$2

 KB=1024
 MB=1048576
 GB=1073741824
 TB=1099511627776
 PB=1125899906842624
 EB=1152921504606846976
 LM=9223372036854775807 # bash comparison limit = 2^63-1 (signed int?)

 [ "$FSIZE" -le 0 ] 2&gt;$OUT &amp;&amp; echo "0 B" &amp;&amp; return
 [ "$FSIZE" -lt $KB ] 2&gt;$OUT &amp;&amp; echo "$FSIZE B" &amp;&amp; return
 [ "$FSIZE" -lt $MB ] 2&gt;$OUT &amp;&amp; echo "$(echo "scale=$DECPTS;$FSIZE/$KB"|bc) KB" &amp;&amp; return
 [ "$FSIZE" -lt $GB ] 2&gt;$OUT &amp;&amp; echo "$(echo "scale=$DECPTS;$FSIZE/$MB"|bc) MB" &amp;&amp; return
 [ "$FSIZE" -lt $TB ] 2&gt;$OUT &amp;&amp; echo "$(echo "scale=$DECPTS;$FSIZE/$GB"|bc) GB" &amp;&amp; return
 [ "$FSIZE" -lt $PB ] 2&gt;$OUT &amp;&amp; echo "$(echo "scale=$DECPTS;$FSIZE/$TB"|bc) TB" &amp;&amp; return
 [ "$FSIZE" -lt $EB ] 2&gt;$OUT &amp;&amp; echo "$(echo "scale=$DECPTS;$FSIZE/$PB"|bc) PB" &amp;&amp; return
 [ "$FSIZE" -le $LM ] 2&gt;$OUT &amp;&amp; echo "$(echo "scale=$DECPTS;$FSIZE/$EB"|bc) EB" &amp;&amp; return
 [ "$?" -ne '0' ] 2&gt;$OUT &amp;&amp; echo "Bad input" &amp;&amp; return 1
}

[[ $_ == $0 ]] &amp;&amp; getFriendlyFileSize $1 $2
</code></pre>

blocks|key|2814355|text|如果你不介意使用bc，那么下面的代码将会帮助你做浮点运算。scale可以根据您的需要根据您要打印的位数进行更改。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2814356|size=1883954

if+[+$size+-ge+1048576+]
then
++++size=$(echo+"scale=2;$size/1048576"%7C+bc)M
elif+[+$size+-ge+1024+]
then
++++size=$(echo+"scale=2;$size/1024"+%7C+bc)K
fi

echo+$size|code-block|syntax|javascript|2814357|entityMap^0|8|2|T|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

If you don't mind using <code>bc</code> then the following will help do floating point operations. <code>scale</code> can changed as per your needs depending on many digits you want to print.

<pre><code>size=1883954

if [ $size -ge 1048576 ]
then
 size=$(echo "scale=2;$size/1048576"| bc)M
elif [ $size -ge 1024 ]
then
 size=$(echo "scale=2;$size/1024" | bc)K
fi

echo $size
</code></pre>

blocks|key|191831|text|如果你碰巧安装了Qalculate!+(顺便说一句，这很棒)，有一个简单的诀窍：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|191832|human_readable="$(+qalc+-t+set+"precision+$precision"+"${in_bytes}B"+)"|code-block|syntax|javascript|191833|示例：|191834|$+qalc+-t+-set+"precision+3"+5264334820B
5.26+GB|191835|它是shell脚本中的一个非常非常强大的工具，因为它甚至可以简化公式，解决未知问题，以及许多其他事情。|191836|$+qalc+-t+"e%5E(i*x)=-1"
x+=+3.1415927|191837|如果你想要一个更简单，更轻量级的解决方案，看看我的另一个答案。|191838|entityMap|0|LINK|mutability|MUTABLE|url|http://qalculate.sourceforge.net/^0|8|A|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|16|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|C|$]]|$1|O|3|P|5|F|7|18|8|@]|9|@]|C|$G|H]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]]]

If you happen to have <a href="http://qalculate.sourceforge.net/" rel="nofollow">Qalculate!</a> installed (which is awesome by the way),
there’s an easy trick:

<pre><code>human_readable="$( qalc -t set "precision $precision" "${in_bytes}B" )"
</code></pre>

Example:

<pre><code>$ qalc -t -set "precision 3" 5264334820B
5.26 GB
</code></pre>

It’s a very very powerful tool to have in shell scripting, as it can even simplify formulas, solve for unknowns, and many many more things.

<pre><code>$ qalc -t "e^(i*x)=-1"
x = 3.1415927
</code></pre>

If you want a simpler, less heavy-weight solution, look at my other answer.

Given the size of a file in bytes, I want to format it with <a href="https://en.wikipedia.org/wiki/Binary_prefix" rel="noreferrer">IEC (binary) prefixes</a> to 3 <a href="http://en.wikipedia.org/wiki/Significant_figures" rel="noreferrer">significant figures</a> with trailing zeros, e.g. 1883954 becomes 1.80M.

Floating-point arithmetic isn't supported in bash, so I used awk instead. The problem is I don't how to keep the trailing zeros. Current solution:

<pre><code>if [ $size -ge 1048576 ]
then
 size=$(awk 'BEGIN {printf "%.3g",'$size'/1048576}')M
elif [ $size -ge 1024 ]
then
 size=$(awk 'BEGIN {printf "%.3g",'$size'/1024}')K
fi
</code></pre>

(The files aren't that big so I don't have to consider bigger units.)

Edit: There's another problem with this. See Adrian Frühwirth's comment below.

File size in human readable format

Linux

给定文件以字节为单位的大小，我想用将其格式化为3  ，并带有尾随零，例如1883954变成1.80M。bash不支持浮点运算，所以我改用awk。问题是我不知道如何保持尾随零。当前解决方案：if [ $size -ge 1048576 ]then    size=$(awk 'BEGIN {printf "%.3g",'$size'/1048576}')Melif [ $size -ge 1024 

问以人类可读格式表示的文件大小
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