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egrep command

How do I check the existing Linux / UNIX users and groups under Linux operating system?
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Most Linux and UNIX-like system configuration files are documented using comments, but some time I just need to see line of configuration text in a config file. How can I view just the uncommented configuration file directives from squid.conf or httpd.conf file? How can I strip out comments and blank lines on a Linux or Unix-like systems?
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Q. How to tell if my Linux server is using xinetd or inetd service?
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Grep Words From a File

Q. How do I grep words from a text file under UNIX / Linux / BSD operating systems?
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How do I use grep command on Linux, Apple OS X, and Unix-like operating systems? Can you give me a simple examples of the grep command?
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I have been using Linux for a while on my server and have a large collection of the text file everywhere. I'm interested in learning about searching a text string. Can you tell me - how do I find a file containing a particular text string on my Linux server?
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grep in Bash

How do I use grep command in Bash?
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