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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>5.6. Numeric</title><link rel="stylesheet" type="text/css" href="..//docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><meta name="keywords" content="shell,bash,zsh, awk,sed,curl,expect, grep,sort" /><link rel="home" href="../index.html" title="Netkiller Linux Shell 手札" /><link rel="up" href="index.html" title="第 5 章 Shell command" /><link rel="prev" href="datatime.html" title="5.5. date and time" /><link rel="next" href="text.html" title="5.7. Text Processing" /></head><body><a xmlns="" href="//www.netkiller.cn/">Home</a> |
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<a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.6. Numeric</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="datatime.html">上一页</a> </td><th width="60%" align="center">第 5 章 Shell command</th><td width="20%" align="right"> <a accesskey="n" href="text.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="numeric"></a>5.6. Numeric</h2></div></div></div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idp70"></a>5.6.1. 数值运算</h3></div></div></div>
<pre class="screen">
echo $((3+5))
expr 6 + 3
awk 'BEGIN{a=(3+2)*2;print a}'
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="seq"></a>5.6.2. seq - print a sequence of numbers</h3></div></div></div>
<pre class="screen">
[neo@test ~]$ seq 10
1
2
3
4
5
6
7
8
9
10
[neo@test ~]$ seq 5 10
5
6
7
8
9
10
</pre>
<p>等差列, 步长设置</p>
<pre class="screen">
$ seq 1 1 10
1
2
3
4
5
6
7
8
9
10
$ seq 1 2 10
1
3
5
7
9
# seq 0 2 10
0
2
4
6
8
10
</pre>
<p>分隔符</p>
<pre class="screen">
# seq -s : -w 1 10
01:02:03:04:05:06:07:08:09:10
# seq -s '|' -w 1 10
01|02|03|04|05|06|07|08|09|10
</pre>
<p>等宽，前导字符用0填充</p>
<pre class="screen">
# seq -w 1 10
01
02
03
04
05
06
07
08
09
10
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="bc"></a>5.6.3. bc - An arbitrary precision calculator language</h3></div></div></div>
<pre class="screen">
$ echo "4*5" | bc
</pre>
<pre class="screen">
# more calc.txt
3+2
4+5
8*2
10/4
# bc calc.txt
5
9
16
2
</pre>
</div>
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