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How to Create Bash Function ?

First step: create a file to add all your bash functions in it. 2nd step: add your bash function/s like this. ## convertMP4toMP3(){ echo -n "Enter source mp4 file : " read sourceFile echo -n "Enter destination mp3 file : " read destFile avconv -i $sourceFile -vn -acodec libmp3lame -ac 2 -ab 160k -ar 48000 $destFile } I created a bash function to convert mp4 video file to mp3 audio file from command line. 3rd step: source the Bash file source Finally, you can call the function from the command line (terminal) and use it like this.