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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>1.8. User interfaces</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 Shell 手札" /><link rel="up" href="index.html" title="第 1 章 Bash Shell" /><link rel="prev" href="functions.html" title="1.7. Functions" /><link rel="next" href="subshell.html" title="1.9. subshell" /></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">1.8. User interfaces</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="functions.html">上一页</a> </td><th width="60%" align="center">第 1 章 Bash Shell</th><td width="20%" align="right"> <a accesskey="n" href="subshell.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="select"></a>1.8. User interfaces</h2></div></div></div>
<div class="example"><a id="idp155"></a><p class="title"><strong>例 1.8. Using select to make simple menus</strong></p><div class="example-contents">
<pre class="programlisting">
#!/bin/bash
OPTIONS="Hello Quit"
select opt in $OPTIONS; do
if [ "$opt" = "Quit" ]; then
echo done
exit
elif [ "$opt" = "Hello" ]; then
echo Hello World
else
clear
echo bad option
fi
done
</pre>
</div></div><br class="example-break" />
<div class="example"><a id="idp156"></a><p class="title"><strong>例 1.9. Using the command line</strong></p><div class="example-contents">
<pre class="programlisting">
#!/bin/bash
if [ -z "$1" ]; then
echo usage: $0 directory
exit
fi
SRCD=$1
TGTD="/var/backups/"
OF=home-$(date +%Y%m%d).tgz
tar -cZf $TGTD$OF $SRCD
</pre>
</div></div><br class="example-break" />
<div class="example"><a id="idp157"></a><p class="title"><strong>例 1.10. Reading user input with read</strong></p><div class="example-contents">
<p>In many ocations you may want to prompt the user for some input, and there are several ways to achive this. This is one of those ways:</p>
<pre class="programlisting">
#!/bin/bash
echo Please, enter your name
read NAME
echo "Hi $NAME!"
</pre>
<p>As a variant, you can get multiple values with read, this example may clarify this.</p>
<pre class="programlisting">
#!/bin/bash
echo Please, enter your firstname and lastname
read FN LN
echo "Hi! $LN, $FN !"
</pre>
</div></div><br class="example-break" />
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idp37"></a>1.8.1. input</h3></div></div></div>
<div class="example"><a id="idp158"></a><p class="title"><strong>例 1.11. read</strong></p><div class="example-contents">
<p>限时30秒内，输入你的名字</p>
<pre class="screen">
$ read -p "Please input your name: " -t 30 named
Please input your name: neo
$ echo $named
</pre>
</div></div><br class="example-break" />
<pre class="screen">
READ_TIMEOUT=60
read -t "$READ_TIMEOUT" input
# if you do not want quotes, then escape it
input=$(sed "s/[;\`\"\$\' ]//g" <<< $input)
# For reading number, then you can escape other characters
input=$(sed 's/[^0-9]*//g' <<< $input)
</pre>
</div>
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