Update README.md

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@ -368,12 +368,12 @@ sed 's=/=\\/=g'
sed 's/A-.*-e//g' filename
```
##### Remove last character of file
```bash``
```bash
sed '$ s/.$//'
```
##### Insert character at specified position of file (e.g. AAAAAA --> AAA#AAA)
```bash``
```bash
sed -r -e 's/^.{3}/&#/' file
```