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Note that the Bourne shell is not POSIX, [[...]] supports regexps only in some versions of some shells, just like some versions of [ do support regexp matching. For arithemtic comparison, in those shells that support [[, you'd rather write (( n == 0 && y == 0))

Stéphane Chazelas
– Stéphane Chazelas

2012-11-25 22:04:01 +00:00
Commented Nov 25, 2012 at 22:04

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Correct minor typos or mistakes
Clarify meaning without changing it
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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>

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