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add grep

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type of grep
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onceupon 2018-10-24 17:23:35 +08:00 committed by GitHub
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@ -94,6 +94,15 @@ or
## Grep
[[back to top](#handy-bash-oneliner-commands)]
##### Type of grep
```bash
grep = grep -G # Basic Regular Expression (BRE)
fgrep = grep -F # fixed text
egrep = grep -E # Extended Regular Expression (ERE)
pgrep = grep -P # Perl Compatible Regular Expressions (PCRE)
rgrep = grep -r # recursive
```
##### Grep only IP address
```bash
grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'