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Add grep command

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Grep and count number of empty lines
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I-Man Ng 2019-05-09 00:00:37 +08:00 committed by GitHub
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@ -99,6 +99,10 @@ egrep = grep -E # Extended Regular Expression (ERE)
pgrep = grep -P # Perl Compatible Regular Expressions (PCRE)
rgrep = grep -r # recursive
```
##### Grep and count number of empty lines
```bash
grep -c "^$"
```
##### Grep and return only integer
```bash