#=> "This is how you print a float: 2.000000"
```
+### Transform strings
+
+| Command option | Description |
+| ------------------ | --------------------------------------------------- |
+| `-c` | Operations apply to characters not in the given set |
+| `-d` | Delete characters |
+| `-s` | Replaces repeated characters with single occurrence |
+| `-t` | Truncates |
+| `[:upper:]` | All upper case letters |
+| `[:lower:]` | All lower case letters |
+| `[:digit:]` | All digits |
+| `[:space:]` | All whitespace |
+| `[:alpha:]` | All letters |
+| `[:alnum:]` | All letters and digits |
+
+#### Example
+
+```bash
+echo "Welcome To Devhints" | tr [:lower:] [:upper:]
+WELCOME TO DEVHINTS
+```
+
### Directory of script
```bash