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docs: options: clarify special characters topic

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Simon Michael 2018-10-11 18:00:36 -07:00
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hledger/hledger_options.m4.md
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@ -39,12 +39,12 @@ and then reuse them by writing `@FILENAME` in a command line.
To prevent this expansion of `@`-arguments, precede them with a `--` argument.
For more, see [Save frequently used options](https://github.com/simonmichael/hledger/wiki/Save-frequently-used-options).
## Special characters
## Special characters in command line
Option and argument values which contain problematic characters
Option and argument values which contain "problematic" characters
should be escaped with double quotes, backslashes, or (best) single quotes.
Problematic characters means spaces, and also characters which are significant to your
command shell, such as less-than/greater-than.
command shell, such as `<`, `>`, '(', ')', '|' and '$'.
Eg: `hledger register -p 'last year' "accounts receivable (receivable|payable)" amt:\>100`.
Characters which are significant both to the shell and in