30 lines
766 B
Markdown
30 lines
766 B
Markdown
---
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title: Bash Grep
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---
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## Bash command: grep
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`grep` stands for Global Regular Expression Print. It is used to search piped input or files for a string which can contain regex.
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### Usage
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```
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grep <some string> <file name>
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```
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Commonly used options:
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* `-i` - Ignores the case when performing the search.
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* `-v` - Inverts the search and only selects lines that do not match the search string.
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### Examples
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#### Search for IP 127.0.0.1 in the /etc/hosts file
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```bash
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grep "127.0.0.1" /etc/hosts
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```
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#### Search for oom (out of memory) in /var/log/messages
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```bash
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grep -i oom /var/log/messages
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```
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### More Information
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* run `man grep` for a full list of available flags/options to use.
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* [Wikipedia](https://en.wikipedia.org/wiki/Grep)
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