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add sed

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add string to beginning of file
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onceupon 2018-08-21 14:04:03 +08:00 committed by GitHub
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@ -236,6 +236,11 @@ sed '$d'
sed -i '$ s/.$//' filename
```
##### Add string to beginning of file (e.g. "\[")
```bash
sed -i '1s/^/[/' file
```
##### Add string to end of file (e.g. "]")
```bash