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The difference between the grep family of utilities is based on what and how they search for patterns, from simple to complex. This also determines the speed at which they can analyze the patterns.

fgrep works on a single string in a file

grep uses regular expressions (one) to find patterns in a file or files

egrep is an extended version (most complex) that finds multiple patterns in a file or files by using multiple regular expressions.

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Q: What is the difference of grap fgrap and egrad commands of unix?
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