linux(or UNIX?) Pipes and streams | >> io redirection..

[Molinko 43]

https://www.youtube.com/watch?v=alEiZFmPNP0

 

I saw, in the video above, that the openOS shell supported pipes, streams, and io redirection. Now Im not sure what the heck all that is but it sounds and looked so useful. Could somebody maybe point me to a good reference on how to use these capabilities or maybe explain like im five, but have been using lua for a year.. I've dabbled in most of the data type of lua and know em alright but I'm a total linux/unix noob and could use a hand understanding how and why someone would use this stuff(pipes n such). Thanks for any help in advance.

    - Fast Eddie

[Sangar 92]

The piping is a feature of besh (which can be found on a loot disk). I think currently it's not even horribly broken. To make stuff compatible for piping, basically make sure to use the `io.read` and `io.write` methods instead of operating on the term or gpu directly, besh automatically wraps those.

[Molinko 43]

The piping is a feature of besh (which can be found on a loot disk). I think currently it's not even horribly broken. To make stuff compatible for piping, basically make sure to use the `io.read` and `io.write` methods instead of operating on the term or gpu directly, besh automatically wraps those.

 

Thanks for the reply. I was messing around in creative and found the besh disk. What  I was way more curious about t how is something like that used and what is a decent example use case? Could one use it for say logging errors to a file or what?

[Wobbo 8]

Pipes are use to redirect the output of a program to a file or another program. So, lets say we have a program curl that downloads files from the internet, but doesn't save them. Then we could write the contents of the downloaded file to harddisk like this:

curl http://example.com > example.html

the > redirects the output to the file. We also have < which reads from a file. So if we take for example grep (oppm install grep should work):

grep 'local .- = .*' < file.lua

we give grep the contents of file.lua as input (grep is a kind of silly example, since it can already read files, but it works. 

 

We can use the | to give the output of one program to the next. So if we are for example looking for files with a specific extension, say .lua we could do this:

ls | grep '%.lua'

This should only print the lines that have .lua as extension.