Bash script string indexing


	Bash script string indexing

lizponine

9-15-2009 2:10 PM

167 views

tags:

bash, script, string

lizponine says:

reminder how to index strings in bash scripts

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/1dac10fd-0125-4edb-a1b7-c3ba7602ec57/C5088D8A-9A0A-4851-AB15-0A8131B24CBE/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.faqs.org/docs/abs/HTML/string-manipulation.html" href="http://www.faqs.org/docs/abs/HTML/string-manipulation.html" style="font-size: 11px;">www.faqs.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><B>Index</B></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><DT>expr index $string $substring</DT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><P>Numerical position in $string of first character in 
	    $substring that matches.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><PRE class="PROGRAMLISTING">   1 stringZ=abcABC123ABCabc
   2 echo `expr index "$stringZ" C12`             # 6
   3                                              # C position.
   4 
   5 echo `expr index "$stringZ" 1c`              # 3
   6 # 'c' (in #3 position) matches before '1'.</PRE></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><B>Substring Extraction</B></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><DT>${string:position}</DT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><P>Extracts substring from <TT class="REPLACEABLE"><I>$string</I></TT> at
	    <TT class="REPLACEABLE"><I>$position</I></TT>.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><DT>${string:position:length}</DT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><P>Extracts <TT class="REPLACEABLE"><I>$length</I></TT> characters
	    of substring from <TT class="REPLACEABLE"><I>$string</I></TT> at
	    <TT class="REPLACEABLE"><I>$position</I></TT>.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><PRE class="PROGRAMLISTING">   1 stringZ=abcABC123ABCabc
   2 #       0123456789.....
   3 #       0-based indexing.
   4 
   5 echo ${stringZ:0}                            # abcABC123ABCabc
   6 echo ${stringZ:1}                            # bcABC123ABCabc
   7 echo ${stringZ:7}                            # 23ABCabc
   8 
   9 echo ${stringZ:7:3}                          # 23A
  10                                              # Three characters of substring.</PRE></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.faqs.org/docs/abs/HTML/string-manipulation.html"><P>This is the near equivalent of
            <SPAN class="emphasis"><I class="EMPHASIS">strchr()</I></SPAN> in C.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/C5088D8A-9A0A-4851-AB15-0A8131B24CBE/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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