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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><HTML><HEAD><TITLE>ASCII Table</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="Advanced Bash-Scripting Guide"HREF="index.html"><LINKREL="PREVIOUS"TITLE="Copyright"HREF="copyright.html"><LINKREL="NEXT"TITLE="Index"HREF="xrefindex.html"><METAHTTP-EQUIV="Content-Style-Type"CONTENT="text/css"><LINKREL="stylesheet"HREF="common/kde-common.css"TYPE="text/css"><METAHTTP-EQUIV="Content-Type"CONTENT="text/html; charset=iso-8859-1"><METAHTTP-EQUIV="Content-Language"CONTENT="en"><LINKREL="stylesheet"HREF="common/kde-localised.css"TYPE="text/css"TITLE="KDE-English"><LINKREL="stylesheet"HREF="common/kde-default.css"TYPE="text/css"TITLE="KDE-Default"></HEAD><BODYCLASS="APPENDIX"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#AA0000"VLINK="#AA0055"ALINK="#AA0000"STYLE="font-family: sans-serif;"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">Advanced Bash-Scripting Guide: An in-depth exploration of the art of shell scripting</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="copyright.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="xrefindex.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="APPENDIX"><H1><ANAME="ASCIITABLE"></A>Appendix R. ASCII Table</H1><P>In a book of this sort it is traditional to have an appendix with an ASCII table. This book does not. Instead, here is a short shell script that generates a complete ASCII table and writes it to the file <TTCLASS="FILENAME">ASCII.txt</TT>.</P><DIVCLASS="EXAMPLE"><HR><ANAME="ASCIISH"></A><P><B>Example R-1. A script that generates an ASCII table</B></P><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING"> 1 #!/bin/bash 2 # ascii.sh 3 4 # Script by Sebastian Arming. 5 # Lightly modified by ABS Guide author. 6 # Used with permission (thanks!). 7 8 exec >ASCII.txt # Save stdout to file, 9 #+ as in the example scripts 10 #+ reassign-stdout.sh and upperconv.sh. 11 12 MAXNUM=256 13 COLUMNS=5 14 OCT=8 15 OCTSQU=64 16 LITTLESPACE=-3 17 BIGSPACE=-5 18 19 i=1 # Decimal counter 20 o=1 # Octal counter 21 22 while [ "$i" -lt "$MAXNUM" ]; do 23 paddi=" $i" 24 echo -n "${paddi: $BIGSPACE} " # Column spacing. 25 paddo="00$o" 26 echo -ne "\\${paddo: $LITTLESPACE}" 27 echo -n " " 28 if (( i % $COLUMNS == 0)); then # New line. 29 echo 30 fi 31 ((i++, o++)) 32 # The octal notation for 8 is 10 and 80 -> 100. 33 (( i % $OCT == 0)) && ((o+=2)) 34 (( i % $OCTSQU == 0)) && ((o+=20)) 35 # We don't have to count past 0777. 36 done 37 38 exit 0</PRE></TD></TR></TABLE><HR></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="copyright.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="xrefindex.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Copyright</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"> </TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Index</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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