Audacity hasn't command line arguments. And speech recognition software does only convert not recordI'm not sure if there is a command for recording or not.
However if you would like to record audio have a look at Audacity.
Download Audacity Download the free Audacity audio editor for Windows, Mac or Linux from our download partner, FossHub: Download Audacity for Windows, Mac or Linux Audacity is free of charge. No registration or hardware purchase required. Screen-Reader Version on macOS For visually impairedwww.audacityteam.org
You also might try speech recogintion software for Linux.
From the command line, there's arecord, which is part of alsa and should be already available on your distro/OS. Simply open a terminal and typeI want to record, so long as a person speaks. When the person ends with speaking the command should save the audio.
How is the command for such a thing.
arcord -d 10 -f U8 my_record.mp3
sudo apt-add-repository ppa:audio-recorder/ppa
sudo apt-get update
sudo apt-get install audio recorder