I am not able to use variables in system command in a C program Post: 302760483

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LEARN ABOUT NETBSD

audioctl

AUDIOCTL(1)						    BSD General Commands Manual 					       AUDIOCTL(1)

NAME

     audioctl -- control audio device

SYNOPSIS

     audioctl [-d device] [-n] -a
     audioctl [-d device] [-n] name ...
     audioctl [-d device] [-n] -w name=value ...

DESCRIPTION

     The audioctl command displays or sets various audio system driver variables.  If a list of variables is present on the command line, then
     audioctl prints the current value of those variables for the specified device.  If the -a flag is specified, all variables for the device are
     printed.  If the -w flag is specified audioctl attempts to set the specified variables to the given values.

     The -d flag can be used to give an alternative audio control device, the default is /dev/audioctl0.

     The -n flag suppresses printing of the variable name.

ENVIRONMENT

     AUDIOCTLDEVICE  the audio control device to use.

FILES

     /dev/audio0     audio I/O device (resets on open)
     /dev/audioctl0  audio control device
     /dev/sound0     audio I/O device (does not reset on open)

EXAMPLES

     To set the playing sampling rate to 11025, you can use
	   audioctl -w play.sample_rate=11025
     To set all of the play parameters for CD-quality audio, you can use
	   audioctl -w play=44100,2,16,slinear_le
     Note that many of the variables that can be inspected and changed with audioctl are reset when /dev/audio0 is opened.  This can be circum-
     vented by using /dev/sound0 instead.

COMPATIBILITY

     The old -f flag is still supported.  This support will be removed eventually.

SEE ALSO

     audioplay(1), audiorecord(1), mixerctl(1), audio(4), sysctl(8)

HISTORY

     The audioctl command first appeared in NetBSD 1.3.

BSD
								 January 27, 2002							       BSD

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