Differences
This shows you the differences between two versions of the page.
linux_wiki:sed [2016/02/05 13:29] billdozor [Remove Lines] |
linux_wiki:sed [2019/05/25 23:50] |
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- | ====== Sed ====== | ||
- | **General Information** | ||
- | |||
- | Stream editor tips and tricks. | ||
- | |||
- | **Checklist** | ||
- | * Linux distro with the ' | ||
- | |||
- | ---- | ||
- | |||
- | ===== Insert Lines ===== | ||
- | |||
- | Insert lines before a found matched pattern. | ||
- | |||
- | Given the contents of / | ||
- | <code bash> | ||
- | # Generated by NetworkManager | ||
- | nameserver 192.168.1.254 | ||
- | </ | ||
- | |||
- | Insert a new DNS entry that will be checked first: | ||
- | <code bash> | ||
- | sed -i '/ | ||
- | </ | ||
- | * / | ||
- | * -i => in-line editing (changes the file in place) | ||
- | * i\ => insert | ||
- | |||
- | Results in: | ||
- | <code bash> | ||
- | # Generated by NetworkManager | ||
- | nameserver 8.8.8.8 | ||
- | nameserver 192.168.1.254 | ||
- | </ | ||
- | |||
- | ==== Insert at first line ==== | ||
- | |||
- | Insert also works against line numbers. | ||
- | |||
- | Insert a new comment at line 1: | ||
- | <code bash> | ||
- | sed -i '1 i\# My first line comment' | ||
- | </ | ||
- | |||
- | Results in: | ||
- | <code bash> | ||
- | # My first line comment | ||
- | # Generated by NetworkManager | ||
- | nameserver 8.8.8.8 | ||
- | nameserver 192.168.1.254 | ||
- | </ | ||
- | |||
- | ---- | ||
- | |||
- | ===== Append Lines ===== | ||
- | |||
- | Append lines after a found matched pattern. | ||
- | |||
- | Given the contents of / | ||
- | <code bash> | ||
- | # Generated by NetworkManager | ||
- | nameserver 8.8.8.8 | ||
- | nameserver 192.168.1.254 | ||
- | </ | ||
- | |||
- | Append a new DNS entry that will be checked 2nd: | ||
- | <code bash> | ||
- | sed -i '/ | ||
- | </ | ||
- | |||
- | Results in: | ||
- | <code bash> | ||
- | # Generated by NetworkManager | ||
- | nameserver 8.8.8.8 | ||
- | nameserver 8.8.4.4 | ||
- | nameserver 192.168.1.254 | ||
- | </ | ||
- | |||
- | ---- | ||
- | |||
- | ===== Remove Lines ===== | ||
- | |||
- | Remove lines that match a pattern. | ||
- | |||
- | Given / | ||
- | <code bash> | ||
- | # Generated by NetworkManager | ||
- | nameserver 8.8.8.8 | ||
- | nameserver 8.8.4.4 | ||
- | nameserver 192.168.1.254 | ||
- | </ | ||
- | |||
- | Remove the 8.8.4.4 entry: | ||
- | <code bash> | ||
- | sed -i '/ | ||
- | </ | ||
- | |||
- | Results in: | ||
- | <code bash> | ||
- | # Generated by NetworkManager | ||
- | nameserver 8.8.8.8 | ||
- | nameserver 192.168.1.254 | ||
- | </ | ||
- | |||
- | ---- |