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<pre><code id="code-20-40884083-1">if grep -qv &quot;^\[[a-z].*[0-9]\]$&quot; /path/to/your/file
then
      echo &quot;File contains invalid characters&quot;
fi</code></pre>
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if grep -qv "^\[[a-z].*[0-9]\]$" /path/to/your/file
then
      echo "File contains invalid characters"
fi

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Thanks for quick Savone, it works !
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<div class="content wysiwyg-content">
Hi , <br />
<br />
I am trying to write a shell script to verify if brackets are used correctly in a file . If there is some other format it should show invalid.<br />
<br />
Below are the correct formats : <br />
<br />
[sunil:/1/2]<br />
[sagar:/1/2/3/4]<br />
<br />
Incorrect formats may have format :<br />
[sunil:/1/2]]<br />
[[sagar:/1/2]<br />
[[sunil:/1/2/3]]<br />
<br />
Please advise .
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</div>


Hi , 

I am trying to write a shell script to verify if brackets are used correctly in a file . If there is some other format it should show invalid.

Below are the correct formats : 

[sunil:/1/2]
[sagar:/1/2/3/4]

Incorrect formats may have format :
[sunil:/1/2]]
[[sagar:/1/2]
[[sunil:/1/2/3]]

Please advise .

shell script to verify brackets

The term 'shell' refers to a general class of text-based command interpreters most often associated with the UNIX and Linux operating systems. Popular shells include Bourne, Debian Almquist (dash), Korn (ksh), Bourne Again (bash) and the C shell family (csh). Some view the DOS 'cmd' prompt as a minimal shell of sorts. It is also possible to install Cygwin on Windows and emulate a full Unix environment with complete shell capabilities. Terminal emulators, such as xterm, GNOME Terminal and OS X Terminal, can be used to access shell.

Shell Scripting

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.