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    <ul> <li>you can't change the <em>cursor</em> line of a <code>while read</code></li> </ul> <p>I wrote this for you with a little <a href="/questions/tagged/hack" class="post-tag" title="show questions tagged 'hack'" rel="tag">hack</a> to prefix the array names with <code>seq N+1</code> :</p> <pre><code>#!/bin/bash file=file.txt while read line; do if [[ $line == S* ]]; then echo "$line" i=0 ((Seq++)) else declare seq${Seq}_2ndColumn[i]="$(echo $line | cut -d\ -f2)" declare seq${Seq}_3rdColumn[i]="$(echo $line | cut -d\ -f3)" ((i++)) fi done &lt; "$file" echo "${!seq*} arrays are declared" </code></pre> <p><strong>OUTPUT</strong></p> <pre><code>seq1_2ndColumn seq1_3rdColumn seq2_2ndColumn seq2_3rdColumn arrays are declared </code></pre> <p><strong>EXPLANATIONS</strong></p> <ul> <li><code>${!pattern*}</code> is a nice feature of bash to display variables beginning with <em>pattern</em></li> <li><code>(( ))</code> is an arithmetic command, which returns an exit status of 0 if the expression is nonzero, or 1 if the expression is zero. Also used as a synonym for "let", if side effects (assignments) are needed. See <a href="http://mywiki.wooledge.org/ArithmeticExpression" rel="nofollow">http://mywiki.wooledge.org/ArithmeticExpression</a></li> </ul> <p><strong>BONUS</strong></p> <p>If you have the control on what's in your array, try doing this at the end ::</p> <pre><code>for s in ${!seq*}; do printf '\t%s\n' $(eval echo \${$s[@]}) done </code></pre> <p>See See <a href="http://mywiki.wooledge.org/BashFAQ/048" rel="nofollow">http://mywiki.wooledge.org/BashFAQ/048</a> </p> <p>new <strong>OUTPUT</strong></p> <pre><code>seq1_2ndColumn 1 2 3 seq1_3rdColumn 5 6 9 seq2_2ndColumn 2 4 8 seq2_3rdColumn 7 9 12 </code></pre>
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