I have a text file and I'm trying to replace a specific character (.) in the first column to another character (-). Every field is delimited by comma. Some of the lines have the last 3 columns empty, so they have 3 commas at the end.
Example of text file:
What I tried was using awk to replace '.' in the first column with '-', then print out the contents.
ETA: Tried out sarnold's suggestion and got the output I want.
ETA2: I could have a longer first column. Is there a way to change ONLY the first 3 '.' in the first column to '-', so I get the output