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# Lua *system* package
Note: some functions only work on UNIX systems.
## Dependencies
Torch7 (www.torch.ch)
## Install
```
$ luarocks install sys
```
## Use
```lua
$ torch
> require 'sys'
```
### Time / Clock
```lua
> t = sys.clock() -- high precision clock (us precision)
> sys.tic()
> -- do something
> t = sys.toc() -- high precision tic/toc
> sys.sleep(1.5) -- sleep 1.5 seconds
```
### Paths
```lua
> path,fname = sys.fpath()
```
Always returns the path of the file in which this call is made. Useful
to access local resources (non-lua files).
### Execute
By default, Lua's `os.execute` doesn't pipe its results (stdout). This
function uses popen to pipe its results into a Lua string:
```lua
> res = sys.execute('ls -l')
> print(res)
```
Derived from this, a few commands:
```lua
> print(sys.uname())
linux
```
UNIX-only: shortcuts to run bash commands:
```lua
> ls()
> ll()
> lla()
```
### sys.COLORS
If you'd like print in colours, follow the following snippets of code. Let start by listing the available colours
```lua
$ torch
> for k in pairs(sys.COLORS) do print(k) end
```
Then, we can generate a shortcut `c = sys.COLORS` and use it within a `print`
```lua
> c = sys.COLORS
> print(c.magenta .. 'This ' .. c.red .. 'is ' .. c.yellow .. 'a ' .. c.green .. 'rainbow' .. c.cyan .. '!')
```
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