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    <p>You don't want the back-quotes in the <code>until</code> line. You might write:</p> <pre><code>until grep -E "$pattern" "$part" do ...body of loop... done </code></pre> <p>Or you might add arguments to <code>grep</code> to suppress the output (or send the output to <code>/dev/null</code>). As written, the script tries to execute the output of the <code>grep</code> command and use the success/failure status of that (not the <code>grep</code> per se) as an indication of whether to continue the loop or not.</p> <p>Additionally, your pattern needs some work. It is:</p> <pre><code>pattern="^([0-9]{1}[0-9]*([km])$" </code></pre> <p>There is an unmatched open parenthesis in there. It also looks to me as though it is trying to allow a leading zero. You probably want:</p> <pre><code>pattern='^[1-9][0-9]*[km]$' </code></pre> <p>Single quotes are generally safer than double quotes for things like regular expressions.</p> <hr> <blockquote> <p>I just want to check if my variable called <code>part</code> is well-formed after writing it in Zenity entry dialog. I just realised that <code>grep</code> needs a file, but my <code>part</code> is a variable initialised in this script. How to get along now?</p> </blockquote> <p>In <code>bash</code>, you can use the <code>&lt;&lt;&lt;</code> operator to redirect from a string:</p> <pre><code>until grep -E "$pattern" &lt;&lt;&lt; "$part" </code></pre> <p>In most other shells, you'd write:</p> <pre><code>until echo "$part" | grep -E "$pattern" </code></pre> <p>This also works in <code>bash</code>, of course.</p>
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    1. POHow to grep a string in until loop in bash?
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    1. COThanks.I just want to check if my variable called 'part' is well-formed after writing it in zenity entry dialog. I just realised that grep needs a file, but my 'part' is a variable initialised in this script. How to get along now?
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