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===== Grep OR – Grep AND – Grep NOT – Match Multiple Patterns =====

The grep, egrep, sed and awk are the most common Linux command line tools for parsing files.\\
From the following article you’ll learn how to match multiple patterns with the OR, AND, NOT operators, using grep, egrep, sed and awk commands from the Linux command line.\\
I’ll show the examples of how to find the lines, that match any of multiple patterns, how to print the lines of a file, that match each of provided patterns and how to find and print the lines, that do not match a pattern (negative matching).

==== GREP OR: Match Any Of Multiple Patterns ====

Find all the lines of a file, that match any of provided patterns.

**Using grep and egrep commands:**

<code>$ grep "PATTERN1\|PATTERN2" FILE
$ grep -E "PATTERN1|PATTERN2" FILE
$ grep -e PATTERN1 -e PATTERN2 FILE
$ egrep "PATTERN1|PATTERN2" FILE</code>\\
**Using awk command:**

<code>
$ awk '/PATTERN1|PATTERN2/' FILE
</code>\\
**Using sed command:**
<code>\\
$ sed -e '/PATTERN1/b' -e '/PATTERN2/b' -e d FILE
</code>\\
=== GREP AND: Match Multiple Patterns ===

It is also often required to grep a file for multiple patterns – when it is needed to find all the lines in a file, that contain not one, but several patterns.\\
Note, that you can both find the lines in a file that match multiple patterns in the exact order or in the any order.\\
Use one of the following commands to find and print all the lines of a file, that match multiple patterns.\\
\\
**Using grep command (exact order):**
<code>
$ grep -E 'PATTERN1.*PATTERN2' FILE
</code>\\
**Using grep command (any order):**
<code>
$ grep -E 'PATTERN1.*PATTERN2|PATTERN2.*PATTERN1' FILE
$ grep 'PATTERN1' FILE | grep 'PATTERN2'
</code>\\
**Using awk command (exact order):**
<code>
$ awk '/PATTERN1.*PATTERN2/' FILE
</code>
**Using awk command (any order):**
<code>
$ awk '/PATTERN1/ && /PATTERN2/' FILE
</code>\\
**Using sed command (exact order):**
<code>
$ sed '/PATTERN1.*PATTERN2/!d' FILE
</code>\\
**Using sed command (any order):**
<code>
$ sed '/PATTERN1/!d; /PATTERN2/!d' FILE
</code>
\\
==== GREP NOT: Negative Matching ====

Find and print all the lines, that do not match a pattern.\\

**Using grep command:**
<code>
$ grep -v 'PATTERN1' FILE
</code>
**Using awk command:**
<code>
$ awk '!/PATTERN1/' FILE
</code>
**Using sed command:**
<code>
$ sed -n '/PATTERN1/!p' FILE
</code>
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