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It does seem to be proper bash, since that works. I am ssh-ing into one of my universities clusters
– Kurru
Commented Mar 11, 2011 at 0:59
4

The $((expression)) syntax is part of the POSIX sh standard, and derived from ksh.
– geekosaur
Commented Mar 11, 2011 at 1:05
7

Bash can only do integer arithmetic. It cannot do floating point arithmetic like ksh93 or zsh
– fpmurphy
Commented Mar 11, 2011 at 2:27
4

This should've been the accepted answer.
– Andreas Hartmann
Commented Sep 30, 2017 at 12:03

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Correct minor typos or mistakes
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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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