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    <blockquote> <p>So, I wrote a shell script in a file named test</p> </blockquote> <pre><code>$ sh test hello </code></pre> <p>This isn't a <code>zsh</code> script: you're calling it with <code>sh</code>, <a href="http://linux.die.net/man/1/sh" rel="noreferrer">which is (almost certainly) <code>bash</code></a>. If you've got the shebang (<code>#!/bin/zsh</code>), you can make it executable (<code>chmod +x &lt;script&gt;</code>) and run it: <code>./script</code>. Alternatively, you can run it with <code>zsh &lt;script&gt;</code>. </p> <blockquote> <p>the result fails. What's wrong with the code?</p> </blockquote> <p>You can wrap in braces: </p> <pre><code>echo ${1} # This'll work with or without the braces. echo ${1[3,5]} # This works in the braces. echo $1[3,5] # This doesn't work. </code></pre> <p>Running this: <code>./test-script hello</code> gives:</p> <pre><code>./test-script.zsh hello hello llo ./test-script.zsh:5: no matches found: hello[3,5] </code></pre> <blockquote> <p>Also I don't know how to extract subString from n to the last. Perhaps do I have to use Array split by regex?</p> </blockquote> <p>Use the <code>[n,last]</code> notation, but wrap in braces. We can determine how long our variable is with, then use the length:</p> <pre><code># Store the length of $1 in LENGTH. LENGTH=${#1} echo ${1[2,${LENGTH}]} # Display from `2` to `LENGTH`. </code></pre> <p>This'll produce <code>ello</code> (prints from the 2nd to the last character of <code>hello</code>). </p> <p>Script to play with:</p> <pre><code>#!/usr/local/bin/zsh echo ${1} # Print the input echo ${1[3,5]} # Print from 3rd-&gt;5th characters of input LENGTH=${#1} echo ${1[2,${LENGTH}]} # Print from 2nd -&gt; last characters of input. </code></pre> <blockquote> <p>You can use the cut command:</p> </blockquote> <p>But that would be using extra baggage - <code>zsh</code> is quite capable of doing all this on it's own without spawning multiple sub-shells for simplistic operations. </p>
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    1. CODebian & Ubuntu nowadays have `sh` link to the more minimal `dash` (not not `bash` as stated above). (See: [Dash as /bin/sh](https://wiki.ubuntu.com/DashAsBinSh))
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