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##### Type of grep
```bash
grep = grep -G # Basic Regular Expression (BRE)
fgrep = grep -F # fixed text
fgrep = grep -F # fixed text, ignoring meta-charachetrs
egrep = grep -E # Extended Regular Expression (ERE)
pgrep = grep -P # Perl Compatible Regular Expressions (PCRE)
rgrep = grep -r # recursive