I have some scripts setup that I would like a master script to call based on a files appearance in a directory. Basically I have what's show below.Script A   uses file aScript B   uses file bCommand C  uses file cI would like to have a master script that looks for file a and if it's there run Script A if not there skip it then proceeds through B and C. All of the files and scripts are to be located within the same directory. Any help would be appreciated. 
Need help running a command based on a file in the directory
ubuntu;scripting;rhel;appearance