Redirection? (I do find some of the strangest things.) Post: 302989240

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Top Forums UNIX for Advanced & Expert Users Redirection? (I do find some of the strangest things.) Post 302989240 by wisecracker on Tuesday 10th of January 2017 09:39:41 AM

01-10-2017

Registered User

Quote:

Originally Posted by RudiC

Did you check the exit code of the command in either case?

No. As it is unimportant; I just don't want it to show nor crash out when a relatively serious error occurs but to be ignored. These are three lines in the code to suit:-
1) \dev\dsp for CygWin, OSS and PulseAudio for Linux.
2) ALSA for Linux ALSA sound systems.
3) OSX 10.12.x or maybe earlier.
If any one fails just ignore and carry on to the next. One of them will work.

Code:

# CygWin /dev/dsp, Linux OSS or PulseAudio.
> /dev/null 2>&1 cat /tmp/noise.raw > /dev/dsp
# Linux ALSA.
aplay /tmp/noise.wav > /dev/null 2>&1
# Apple OSX 10.12.x and greater.
afplay /tmp/noise.wav > /dev/null 2>&1

As Apple OSX 10.7.x at least has 'afplay' by default on a virgin install then there should be no reason for the code to fail.
CygWin(64) has /dev/dsp in a default virgin install.
Linux is variable as it could have either ALSA, OSS or PulseAudio sound systems.

wisecracker

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LEARN ABOUT DEBIAN

ossdevlinks

ossdevlinks(8)						OSS System Administration Commands					    ossdevlinks(8)

NAME

       ossdevlinks - Open Sound System legacy device management utility.

SYNOPSIS

       ossdevlinks [-vr]

DESCRIPTION

       The ossdevlinks utility creates and manages old style (legacy) device files for OSS audio, MIDI and mixer devices.

       In  previous versioms OSS used "flat" device numbering for the device files (for example /dev/dsp0 to /dev/dspN). OSS version 4.0 and later
       uses different naming scheme. The ossdevlinks utility is used to manage the legacy device names as symbolic links to the new style devices.

OPTIONS

       Normally ossdevlinks is used without command line arguments. However there are a few command line options.

       -f<name>
	      Write legacydev file to <fname>.

       -N     Do not actually modify device files

       -r     Reset the legacy device numbering (do not use).

       -v     Verbose output

       The -r option may invalidate audio device selections in the setup files of various applications. This  is  considered  highly  undesirable.
       Applications using wrong audio devices may cause serious security and privacy problems.	For this reason the -r option should never be used
       unless there are no other ways to recover from serious audio/sound related problems. After that users should review the audio  settings	of
       all the audio applications they are using.

SEE ALSO

       ossinfo(1)

FILES

       /usr/sbin/ossdevlinks /var/lib/oss4/legacy_devices /dev/dspN /dev/midiNN /dev/mixerN

AUTHOR

       4Front Technologies

								 16 December 2012						    ossdevlinks(8)