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website/content/ChapterSix/Heredoc1.md

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+---
+title: 1.01 使用heredocument打印消息
+type: docs
+weight: 1
+---
+
+## 打印常规消息
+```bash
+#!/bin/bash
+
+cat << EOF
+------------
+This is line 1 of the essage.
+This is line2 of the message.
+This is line3 of the message.
+This is line4 of the message
+This is the last line of the message.
+-------------
+EOF
+```   
+执行输出    
+```bash
+------------
+This is line 1 of the essage.
+This is line2 of the message.
+This is line3 of the message.
+This is line4 of the message
+This is the last line of the message.
+-------------
+```   
+
+## 打印抑制tab消息   
+```bash
+#!/bin/bash
+
+cat <<-EOF
+------------
+	This is line 1 of the essage.
+	This is line2 of the message.
+	This is line3 of the message.
+	This is line4 of the message
+ This is the last line of the message.
+-------------
+EOF
+```   
+执行输出    
+```bash
+------------
+This is line 1 of the essage.
+This is line2 of the message.
+This is line3 of the message.
+This is line4 of the message
+ This is the last line of the message.
+-------------
+```   
+
+## 打印帮助信息   
+```bash
+#!/bin/bash
+
+DOC_REQUEST=80
+
+if [ "$1" = "-h" -o "$1" = "--help" ]
+then
+  cat <<EOF
+List the statistics of a specified directory in tabular format
+---------------------------------------------------------------
+The command line parameter gives the directory to be listed
+EOF
+exit $DOC_REQUEST
+fi
+```   
+
+## 打印的消息输入到文件   
+```bash
+#!/bin/bash
+
+cat > newfile << EOF
+------------
+This is line 1 of the essage.
+This is line2 of the message.
+This is line3 of the message.
+This is line4 of the message
+This is the last line of the message.
+-------------
+EOF
+```   
+
+
+
+<div style="display: flex;justify-content: space-between;align-items: center;">
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix">上一页➡️</a></p>
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterFive/Chongdingxiang2">下一页➡️</a></p>
+</div>

website/content/ChapterSix/Heredoc2.md

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+---
+title: 1.02 Heredocument与函数
+type: docs
+weight: 1
+---
+
+同一脚本中heredocument输出内容作为函数的输入使用   
+```bash
+#!/bin/bash
+
+
+geo ()
+{
+read a
+read b
+read c
+}
+
+geo <<EOF
+1
+2
+3
+EOF
+
+echo $a $b $c
+exit 0
+```
+
+<div style="display: flex;justify-content: space-between;align-items: center;">
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc1">上一页➡️</a></p>
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc3">下一页➡️</a></p>
+</div>

website/content/ChapterSix/Heredoc3.md

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+---
+title: 1.03 Heredocument与变量
+type: docs
+weight: 1
+---
+
+heredocument的输出保存到变量中   
+```bash
+#!/bin/bash
+
+a=$(
+cat <<EOF
+def
+EOF
+)
+
+echo $a
+```
+
+<div style="display: flex;justify-content: space-between;align-items: center;">
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc2">上一页➡️</a></p>
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc4">下一页➡️</a></p>
+</div>

website/content/ChapterSix/Heredoc4.md

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+---
+title: 1.04 Heredocument与参数替换
+type: docs
+weight: 1
+---
+
+heredocument输出内容是可以含有变量,但是变量是否被替换取决于heredocument的limit string是否被引用   
+
+## 不被引用的情况   
+```bash
+#!/bin/bash
+Name="wangteng"
+Respondent="the author of the fine scripts"
+cat <<EOF
+hello,there ,$Name
+greetings to you,$Name,from $Respondent
+EOF
+
+exit 0
+```   
+执行输出   
+```bash
+hello,there ,wangteng
+greetings to you,wangteng,from the author of the fine scripts
+```   
+
+## 引用的情况   
+```bash
+#!/bin/bash
+Name="wangteng"
+Respondent="the author of the fine scripts"
+cat <<'EOF'
+hello,there ,$Name
+greetings to you,$Name,from $Respondent
+EOF
+
+exit 0
+```   
+执行输出   
+```bash
+hello,there ,$Name
+greetings to you,$Name,from $Respondent
+```   
+
+## 利用禁用参数替换的特点来实现使用脚本生成脚本或其他代码   
+```bash
+#!/bin/bash
+
+outfile=generated.sh
+
+(
+cat <<'EOF'
+#!/bin/bash
+
+echo "this is a generated shell script"
+echo "generated file will be named $outfile"
+
+a=7
+b=3
+
+let "c = $a * $b"
+echo "c = $c"
+exit 0
+EOF
+) > $outfile
+
+if [ -f "$outfile" ]
+then
+  chmod 755 $outfile
+else
+  echo "have in creating file: \"$outfile\""
+fi
+
+exit 0
+```   
+
+<div style="display: flex;justify-content: space-between;align-items: center;">
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc2">上一页➡️</a></p>
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc4">下一页➡️</a></p>
+</div>

website/content/ChapterSix/Heredoc5.md

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+---
+title: 1.05 使用Heredocument注释代码块
+type: docs
+weight: 1
+---
+
+heredocument可以用来注释代码块   
+```bash
+#!/bin/bash
+
+:<<EOF
+echo 123
+EOF
+echo 456
+```   
+
+<div style="display: flex;justify-content: space-between;align-items: center;">
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc4">上一页➡️</a></p>
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc6">下一页➡️</a></p>
+</div>

website/content/ChapterSix/_index.md

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+---
+title: 第五章 heredocument
+type: docs
+weight: 5
+---   
+
+将一段命令序列传递到一个交互程序中，例如cat ftp expect
+
+<div style="display: flex;justify-content: space-between;align-items: center;">
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterFive">上一章➡️</a></p>
+<p><a href="https://books.linuxwt.com/linuxwtabs/ChapterSix/Heredoc1">下一页➡️</a></p>
+</div>