I had not even thought about my first line except that I don't know how to create a zero length file > somefile in awk yet.
I use the system() function to do this task at the moment...
You might have noticed that I removed that system() call in the code I suggested. Scrutinizer has already shown you how to create a zero length file entirely using awk using printf with a redirection. But, since your code always creates this file with data, there is no need to do that. You can create a file (and remove any pre-existing contents, if there were any) in awk just like you can in the shell by redirecting an output command, such as the way I did with:
I should, however, have added:
after that line to flush the output buffer and release the file descriptor.
You could certainly change the script from:
to:
and avoid invoking an extra shell to run your awk script.
But, if you want your script to process command-line options, using getopts in the shell is much easier than trying to duplicate its capabilities inside awk. And, if you have a configuration file that should always be given as the first file operand to your script (and you don't want users to have to type that configuration file's name every time they invoke your script), it is easier to process if you use a shell script to invoke awk instead of just having a awk only script:
versus:
And, if you're creating temp files in your script that you want to remove when your script is done, the following two scripts are equally efficient as to the number of processes invoked:
versus:
but the shell version will remove the temp file even if the script is killed (except by kill -9) while the awk version will leave the temp file laying around if it is killed. And the shell version can have multiple instances running without them interfering with each other because it creates a unique temp file for each running script while the awk version has a single temp file that will be removed by the 1st instance that exits leaving other running instances with no temp file to process (producing errors when sox tries to process the non-existent temp file).
As frequently happens, this is another instance where UNIX systems give you several ways to do things and you need to decide which best suits your needs.
These 2 Users Gave Thanks to Don Cragun For This Post:
IKHz_SW_OSX.py
A DEMO mono _pure_ sinewave generator using standard text mode Python 2.6.7 to at least 2.7.3.
This code is EASILY modifyable to Python version 3.x.x...
This DEMO kids level 1KHz generator is mainly for a MacBook Pro, (13 inch in my case), OSX 10.7.5 and above. See below...... (0 Replies)
A very simple crude sinewave generator.
The file required is generated inside the code, is linear interpolated and requires /dev/audio to work. Ensure you have this device, if not the download oss-compat from your OS's repository...
It lasts for about 8 seconds before exiting and saves a... (5 Replies)
I'm trying to record audio using Audacity 2.0.5 installed from SlackBuilds. My system is 64-bit Slackware 14.1 and a sound card is Intel HD Audio. I didn't change my sound system to OSS. (Default sound system in Slackware 14.1 is ALSA, isn't it?) First, I set Internal Microphone slider in KMix... (2 Replies)
This is a small program as a tester for a basic sweep generator for bandwidth testing of AudioScope.sh.
This DEMO is only capable of 4KHz down to about 85Hz and back due to the low bit rate, but it is proof of concept for a much wider variant using a much higher bit rate.
The file generated... (4 Replies)
Hi all...
I intend to do an Audio Function Generator using Awk, (already started thanks to Don), but the biggest thing I have struggled with was variable frequency.
I was going to generate differing sized waveforms on the fly but that would that would mean the frequencies are dependent on any... (2 Replies)
Hi all...
Well I have not been inactive but working out how to make OSX 10.14.x command line audio player have a variable sample rate.
This is a back door as afplay does not have a sample rate flag unlike aplay for ALSA, in Linux flavours.
This is a DEMO only but a derivative of it will... (2 Replies)
Hello
I use a bash script to creating the hosts file /etc/hosts
But there is a bug inside my output and I want to fix this.
My Array looks like this:
205,IP 111.122.133.20
205,HOST2 unas
205,HOST1 unas15533
205,COMMENT # UNAS
775,IP ... (9 Replies)