Is UNIX an open source OS ? Post: 302910459

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Operating Systems Linux Fedora Is UNIX an open source OS ? Post 302910459 by wisecracker on Thursday 24th of July 2014 03:24:45 PM

07-24-2014

Registered User

It does not really matter these days whether UNIX per-se is completely open sourced or not.
As some versions are, some are not, however the simplicity coupled with power at your fingertips is legendary these days...

As a novice at the *NIX family of OSes the single beauty to me is that everything is a __file__.
These __files__ can technically be read from and written to without much of a fuss.

Take the following, (this assumes /dev/dsp exists and an internal mic on your system)......

Code:

cat < /dev/dsp > /dev/dsp

......records a few seconds of voice then replays that recording from from the same device, continuously.
This could be the basis of a simple baby alarm all with the simplicity of "everything is a file".

So from one line of 25 characters of an open sourced command, cat , you have tremendous power at your fingertips.

This alone is both elegant and beautiful, and 'cat' along with other *NIX commands IS/ARE open source...

wisecracker

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LEARN ABOUT REDHAT

record

record(1)						      General Commands Manual							 record(1)

NAME

       record - records *.wav files

SYNOPSIS

       record [ options ]

DESCRIPTION

       record records *.wav files in CD quality (i.e. 44100 Hz, 16bit, stereo).  It has a input level meter, which might be useful for sound trou-
       ble shooting (check if the mixer settings ok for recording from the TV card etc.)

OPTIONS

       -h     display help text

       -o file
	      basename for the output file(s), a number and the .wav extention are added by record.  Default is "record".

       -i dev mixer control.  This should be the one where you can adjust the record level for your audio source.  Default is "line".	"mic"  and
	      "igain" are good candidates too.	Best way to figure is to start your favorite mixer tool and check out which one works ...

       -m dev set mixer device.  Default is "/dev/mixer".

       -d dev set audio device.  Default is "/dev/dsp".

       -r rate
	      set sample rate.	Default is 44100.

       -p sec peak  seconds  (number  of  seconds which should be scanned for the volume maximum).  This affects both peak level display and level
	      triggered recording (see below).	Default is 1.5 seconds.

       record can also be used non-interactive:

       -c     enable console (non-interactive) mode.

       -v     be verbose (console mode only).

       -t mm:ss
	      Limit the record time (console mode only).  By default record records until stopped by a signal (by typing ^C for example).

       -s size
	      Limit the file size (console mode only).	record will continue with a new file once the limit is reached.

       -l     Enable level triggered recording (console mode only) with the default trigger level (1000).

       -L level
	      Enable level triggered recording with the specified trigger level.

       If level triggered recording is active, record will start and stop recording depending on the signal strength.  Recording will  be  started
       if  the signal strength is above the trigger level (1000/32768 => around 3%).  Recording will be stopped if the signal is below the trigger
       level for some time (1.5 seconds by default, the -p switch changes this).

AUTHOR

       Gerd Knorr <kraxel@bytesex.org>

								  (c) Gerd Knorr							 record(1)