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;doc: special characters: edit

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Simon Michael 2024-10-16 18:39:06 -10:00
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hledger/hledger.m4.md
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@ -277,6 +277,13 @@ Here we touch on shell escaping/quoting rules, and give some examples.
This is a slightly complicated topic which you may not need at first,
but you should be aware of it, so you can return here when needed.
If you are able to minimise the use of special characters in your data,
you won't need escaping as much, and your command lines will be simpler.
For example, avoiding spaces in account names, and using an ISO-4217 currency code like `USD`
instead of the `$` currency symbol, can be helpful.
But if you want to use spaced account names and `$`, go right ahead; escaping isn't a big deal.
### Escaping shell special characters
At the command line, characters which have special meaning for your shell
@ -304,7 +311,7 @@ In Unix shells, writing a backslash before the character can also work. Eg:
$ hledger register credit\ card
```
Some shell characters still have a special meaning inside double quotes, such as the dollar sign in Unix shells.
Some shell characters still have a special meaning inside double quotes, such as the dollar sign (`$`).
Eg in `"assets:$account"`, the bash shell would replace `$account` with the value of a shell variable with that name.
When you don't want that, use single quotes, which escape more strongly:
@ -394,7 +401,7 @@ For example, backslash-quoting generally does not work there. Here are some more
### Using a wild card
When escaping a special character is too much hassle (or impossible), you can often just write `.` (a period) instead.
When escaping a special character is too much hassle (or impossible), you can often just write `.` (period) instead.
In regular expressions, this means "accept any character here".
Eg: