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Update bash.md

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@ -192,12 +192,16 @@ comment
### Substrings
| `${FOO:0:3}` | Substring _(position, length)_ |
| `${FOO:(-3):3}` | Substring from the right |
| Expression | Description |
| --------------- | ------------------------------ |
| `${FOO:0:3}` | Substring _(position, length)_ |
| `${FOO:(-3):3}` | Substring from the right |
### Length
| `${#FOO}` | Length of `$FOO` |
| Expression | Description |
| ---------- | ---------------- |
| `${#FOO}` | Length of `$FOO` |
### Manipulation