EGREP:
The Command egrep is the same as running grep –E. egrep is used to search for a pattern using extended regular expressions.
Terry@f:~/FinderDing>cat testsort
A line 1
a line 2
8 line 3
line 4
5 line 5 Terry@f:~/FinderDing>egrep '^[a-zA-Z]' testsort
A line 1
a line 2
line 4*Show lines that start with a letter from alphabet
Terry@f:~/FinderDing>cat html
<!DOCTYPE html>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>Terry@f:~/FinderDing>egrep "My|first" html
<h1>My First Heading</h1>
<p>My first paragraph.</p>`*Find lines with pattern My first from html file
FGREP:
The command fgrep is the same as running grep –F. The Command searches for fixed character strings in a file, which means regular expressions can’t be used.
Terry@f:~/FinderDing>fgrep "My" html
<h1>My First Heading</h1>
<p>My first paragraph.</p>l