Differences
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linux_wiki:sed [2015/09/09 22:34] billdozor created |
linux_wiki:sed [2019/05/25 23:50] (current) |
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| Line 6: | Line 6: | ||
| **Checklist** | **Checklist** | ||
| - | * Linux distro with the ' | + | * Distro(s): Any |
| + | * Package: | ||
| ---- | ---- | ||
| - | ===== Insert Lines ===== | + | ====== Print Lines ====== |
| + | |||
| + | Different ways to print specific lines. | ||
| + | |||
| + | Print only line 5 pattern space< | ||
| + | * -n => silent; do not print the entire file | ||
| + | |||
| + | Line 5, don't delete it<code bash>sed ' | ||
| + | * !d => don't delete | ||
| + | |||
| + | Print up to line 5, quit and delete the rest of the output< | ||
| + | * q => quit/stop processing more input | ||
| + | * d => delete the pattern space (removes all but line 5 from output) | ||
| + | |||
| + | ---- | ||
| + | |||
| + | ====== Swap Patterns ====== | ||
| + | |||
| + | Edit files by swapping pattern spaces. | ||
| + | |||
| + | * Before< | ||
| + | # Generated by NetworkManager | ||
| + | search local | ||
| + | nameserver 208.67.222.222 | ||
| + | nameserver 208.67.220.220</ | ||
| + | * After< | ||
| + | # Generated by NetworkManager | ||
| + | search local | ||
| + | nameserver 8.8.8.8 | ||
| + | nameserver 208.67.220.220</ | ||
| + | * -i => In-line editing | ||
| + | * s => swap | ||
| + | * g => global swap (swap every match, not just the first one) | ||
| + | |||
| + | ---- | ||
| + | |||
| + | ====== Insert Lines ====== | ||
| Insert lines before a found matched pattern. | Insert lines before a found matched pattern. | ||
| Line 30: | Line 67: | ||
| Results in: | Results in: | ||
| <code bash> | <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 | # Generated by NetworkManager | ||
| nameserver 8.8.8.8 | nameserver 8.8.8.8 | ||
| Line 37: | Line 91: | ||
| ---- | ---- | ||
| - | ===== Append Lines ===== | + | ====== Append Lines ====== |
| Append lines after a found matched pattern. | Append lines after a found matched pattern. | ||
| Line 63: | Line 117: | ||
| ---- | ---- | ||
| - | ===== Remove Lines ===== | + | ====== Remove Lines ====== |
| Remove lines that match a pattern. | Remove lines that match a pattern. | ||
| Line 77: | Line 131: | ||
| Remove the 8.8.4.4 entry: | Remove the 8.8.4.4 entry: | ||
| <code bash> | <code bash> | ||
| - | sed i '/ | + | sed -i '/ |
| </ | </ | ||