11-29-2007
Quote:
Originally Posted by
Lakris
Yes, Dragon and Porter, I must admit I overlooked the basic concept of *ashism, that is, use < as internal instead of cat or backticks to save cycles or whatever but I tried to exemplify a concept. To push one thing through another.
I may stand corrected, but I am still offended to have been associated with UUOC...
Once again - that was not the intent!
I simply pointed out what I thought would be interesting for the OTHERS (including you) to know and to read up on - after all these forums (and many others on the net) is for sharing the knowledge. If one does not feel (s)he is gaining any - maybe it's time to reconsider.
As far as the UUOC goes... I have not been using the 'cat | grep | grep | awk | sed' "technique" for years now. It's simply not my personal style of coding. Not because I'd feel offended if I do, but simply because I do it differently - UUOC or noUUOC.
Now.... whether you want to code this way or not - it's YOUR call. But knowing the alternatives and the reasoning behind it (regardless whether you agree with it or not) I'd think it's somewhat advantageous!
Last edited by vgersh99; 11-29-2007 at 08:22 AM..
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LEARN ABOUT LINUX
unbuffer
UNBUFFER(1) General Commands Manual UNBUFFER(1)
NAME
unbuffer - unbuffer output
SYNOPSIS
unbuffer program [ args ]
INTRODUCTION
unbuffer disables the output buffering that occurs when program output is redirected from non-interactive programs. For example, suppose
you are watching the output from a fifo by running it through od and then more.
od -c /tmp/fifo | more
You will not see anything until a full page of output has been produced.
You can disable this automatic buffering as follows:
unbuffer od -c /tmp/fifo | more
Normally, unbuffer does not read from stdin. This simplifies use of unbuffer in some situations. To use unbuffer in a pipeline, use the
-p flag. Example:
process1 | unbuffer -p process2 | process3
CAVEATS
unbuffer -p may appear to work incorrectly if a process feeding input to unbuffer exits. Consider:
process1 | unbuffer -p process2 | process3
If process1 exits, process2 may not yet have finished. It is impossible for unbuffer to know long to wait for process2 and process2 may
not ever finish, for example, if it is a filter. For expediency, unbuffer simply exits when it encounters an EOF from either its input or
process2.
In order to have a version of unbuffer that worked in all situations, an oracle would be necessary. If you want an application-specific
solution, workarounds or hand-coded Expect may be more suitable. For example, the following example shows how to allow grep to finish pro-
cessing when the cat before it finishes first. Using cat to feed grep would never require unbuffer in real life. It is merely a place-
holder for some imaginary process that may or may not finish. Similarly, the final cat at the end of the pipeline is also a placeholder
for another process.
$ cat /tmp/abcdef.log | grep abc | cat
abcdef
xxxabc defxxx
$ cat /tmp/abcdef.log | unbuffer grep abc | cat
$ (cat /tmp/abcdef.log ; sleep 1) | unbuffer grep abc | cat
abcdef
xxxabc defxxx
$
BUGS
The man page is longer than the program.
SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
AUTHOR
Don Libes, National Institute of Standards and Technology
1 June 1994 UNBUFFER(1)