Quoting
Quotes are used when assigning values containing whitespace or special characters, to delimit variables, and to assign command output. They also improve readability by separating arguments from commands.
| '...' | remove the special meaning of enclosed characters except ' |
| "..." | remove the special meaning of enclosed characters except $, ', and |
| c | remove the special meaning of character c |
| `command ` | replace with the standard output of command |
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