Differences
This shows you the differences between two versions of the page.
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linux_wiki:sed [2015/09/09 22:38] billdozor [Insert 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 | ||
| - | </ | ||
| - | |||
| - | ---- | ||