273 lines
3.6 KiB
HTML
273 lines
3.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<HTML
|
|
><HEAD
|
|
><TITLE
|
|
>More on variables</TITLE
|
|
><META
|
|
NAME="GENERATOR"
|
|
CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
|
|
REL="HOME"
|
|
TITLE="Bash Guide for Beginners"
|
|
HREF="index.html"><LINK
|
|
REL="PREVIOUS"
|
|
TITLE="Exercises"
|
|
HREF="sect_09_09.html"><LINK
|
|
REL="NEXT"
|
|
TITLE="Types of variables"
|
|
HREF="sect_10_01.html"></HEAD
|
|
><BODY
|
|
CLASS="chapter"
|
|
BGCOLOR="#FFFFFF"
|
|
TEXT="#000000"
|
|
LINK="#0000FF"
|
|
VLINK="#840084"
|
|
ALINK="#0000FF"
|
|
><DIV
|
|
CLASS="NAVHEADER"
|
|
><TABLE
|
|
SUMMARY="Header navigation table"
|
|
WIDTH="100%"
|
|
BORDER="0"
|
|
CELLPADDING="0"
|
|
CELLSPACING="0"
|
|
><TR
|
|
><TH
|
|
COLSPAN="3"
|
|
ALIGN="center"
|
|
>Bash Guide for Beginners</TH
|
|
></TR
|
|
><TR
|
|
><TD
|
|
WIDTH="10%"
|
|
ALIGN="left"
|
|
VALIGN="bottom"
|
|
><A
|
|
HREF="sect_09_09.html"
|
|
ACCESSKEY="P"
|
|
>Prev</A
|
|
></TD
|
|
><TD
|
|
WIDTH="80%"
|
|
ALIGN="center"
|
|
VALIGN="bottom"
|
|
></TD
|
|
><TD
|
|
WIDTH="10%"
|
|
ALIGN="right"
|
|
VALIGN="bottom"
|
|
><A
|
|
HREF="sect_10_01.html"
|
|
ACCESSKEY="N"
|
|
>Next</A
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
><HR
|
|
ALIGN="LEFT"
|
|
WIDTH="100%"></DIV
|
|
><DIV
|
|
CLASS="chapter"
|
|
><H1
|
|
><A
|
|
NAME="chap_10"
|
|
></A
|
|
>Chapter 10. More on variables</H1
|
|
><DIV
|
|
CLASS="TOC"
|
|
><DL
|
|
><DT
|
|
><B
|
|
>Table of Contents</B
|
|
></DT
|
|
><DT
|
|
>10.1. <A
|
|
HREF="sect_10_01.html"
|
|
>Types of variables</A
|
|
></DT
|
|
><DD
|
|
><DL
|
|
><DT
|
|
>10.1.1. <A
|
|
HREF="sect_10_01.html#sect_10_01_01"
|
|
>General assignment of values</A
|
|
></DT
|
|
><DT
|
|
>10.1.2. <A
|
|
HREF="sect_10_01.html#sect_10_01_02"
|
|
>Using the declare built-in</A
|
|
></DT
|
|
><DT
|
|
>10.1.3. <A
|
|
HREF="sect_10_01.html#sect_10_01_03"
|
|
>Constants</A
|
|
></DT
|
|
></DL
|
|
></DD
|
|
><DT
|
|
>10.2. <A
|
|
HREF="sect_10_02.html"
|
|
>Array variables</A
|
|
></DT
|
|
><DD
|
|
><DL
|
|
><DT
|
|
>10.2.1. <A
|
|
HREF="sect_10_02.html#sect_10_02_01"
|
|
>Creating arrays</A
|
|
></DT
|
|
><DT
|
|
>10.2.2. <A
|
|
HREF="sect_10_02.html#sect_10_02_02"
|
|
>Dereferencing the variables in an array</A
|
|
></DT
|
|
><DT
|
|
>10.2.3. <A
|
|
HREF="sect_10_02.html#sect_10_02_03"
|
|
>Deleting array variables</A
|
|
></DT
|
|
><DT
|
|
>10.2.4. <A
|
|
HREF="sect_10_02.html#sect_10_02_04"
|
|
>Examples of arrays</A
|
|
></DT
|
|
></DL
|
|
></DD
|
|
><DT
|
|
>10.3. <A
|
|
HREF="sect_10_03.html"
|
|
>Operations on variables</A
|
|
></DT
|
|
><DD
|
|
><DL
|
|
><DT
|
|
>10.3.1. <A
|
|
HREF="sect_10_03.html#sect_10_03_01"
|
|
>Arithmetic on variables</A
|
|
></DT
|
|
><DT
|
|
>10.3.2. <A
|
|
HREF="sect_10_03.html#sect_10_03_02"
|
|
>Length of a variable</A
|
|
></DT
|
|
><DT
|
|
>10.3.3. <A
|
|
HREF="sect_10_03.html#sect_10_03_03"
|
|
>Transformations of variables</A
|
|
></DT
|
|
></DL
|
|
></DD
|
|
><DT
|
|
>10.4. <A
|
|
HREF="sect_10_04.html"
|
|
>Summary</A
|
|
></DT
|
|
><DT
|
|
>10.5. <A
|
|
HREF="sect_10_05.html"
|
|
>Exercises</A
|
|
></DT
|
|
></DL
|
|
></DIV
|
|
><BLOCKQUOTE
|
|
CLASS="ABSTRACT"
|
|
><DIV
|
|
CLASS="abstract"
|
|
><A
|
|
NAME="AEN6296"
|
|
></A
|
|
><P
|
|
></P
|
|
><P
|
|
>In this chapter, we will discuss the advanced use of variables and arguments. Upon completion, you will be able to:</P
|
|
><P
|
|
> <P
|
|
></P
|
|
><UL
|
|
><LI
|
|
><P
|
|
>Declare and use an array of variables</P
|
|
></LI
|
|
><LI
|
|
><P
|
|
>Specify the sort of variable you want to use</P
|
|
></LI
|
|
><LI
|
|
><P
|
|
>Make variables read-only</P
|
|
></LI
|
|
><LI
|
|
><P
|
|
>Use <B
|
|
CLASS="command"
|
|
>set</B
|
|
> to assign a value to a variable</P
|
|
></LI
|
|
></UL
|
|
>
|
|
</P
|
|
><P
|
|
></P
|
|
></DIV
|
|
></BLOCKQUOTE
|
|
></DIV
|
|
><DIV
|
|
CLASS="NAVFOOTER"
|
|
><HR
|
|
ALIGN="LEFT"
|
|
WIDTH="100%"><TABLE
|
|
SUMMARY="Footer navigation table"
|
|
WIDTH="100%"
|
|
BORDER="0"
|
|
CELLPADDING="0"
|
|
CELLSPACING="0"
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="sect_09_09.html"
|
|
ACCESSKEY="P"
|
|
>Prev</A
|
|
></TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="index.html"
|
|
ACCESSKEY="H"
|
|
>Home</A
|
|
></TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="sect_10_01.html"
|
|
ACCESSKEY="N"
|
|
>Next</A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
>Exercises</TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
> </TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
>Types of variables</TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
></BODY
|
|
></HTML
|
|
> |