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Working on a little script the other day I had the need to determine if the input to the script was coming from a pipe or from the terminal. Seems like a simple enough thing to determine but nothing jumped immediately to mind and a quick internet search didn't help much either. After a bit of pondering I came up with two solutions: the stat command and using information from the proc file system.
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Open Access in Biblioblogs Testlauf: Feeds von Google News, Google Blogs und Planet Biblioblog Annotated link http://www.diigo.com/bookmark/http%3A%2F%2Fpipes.yahoo.com%2Fpipes%2Fpipe.info%3F_id%3DZI5tSoJh3hGRGB6ye6AMnA
Named Pipes... or how to get two separate applications to interact Recently, I've been working on an application (bash based) that could gather some information that I need from a host (network interfaces configuration, arp neighborgs, routing policy, pinging some other hosts, etc). Then I wondered that it would be good if I were able to connect to some hosts through SSH and run some commands on those hosts and save the output of those commands as part of the information of the first host. Like an information gatherer of sorts.
When you pipe the output, ls acts differently.
This fact is hidden away in the info documentation:
If standard output is a terminal, the output is in columns (sorted vertically) and control characters are output as question marks; otherwise, the output is listed one per line and control characters are output as-is.
To prove it, try running
ls
and then
ls | less
R. Franke, F. Casella, M. Sielemann, K. Prölß, M. Otter, and M. Wetter. Proceedings of the 7th International Modelica Conference, volume 43 of Linköping Electronic Conference Proceedings, page 122--131. Linköping, Linköping University Electronic Press, Linköpings universitet, (2009)