What is the default delimiter used by the `paste` command?

That's a great question, and you've already observed it in action!

The default delimiter used by the paste command is a tab character.

When you ran:

paste fruits.txt colors.txt tastes.txt

The output you saw was:

apple   red     sweet
banana  yellow  sweet
cherry  red     sweet

Notice the spaces between "apple" and "red", and "red" and "sweet"? These are actually tab characters, which paste inserts by default to separate the columns (the content from each file).

You then explicitly changed this with the -d ':' option to use a colon as the delimiter, which clearly showed the change:

paste -d ':' fruits.txt colors.txt tastes.txt

apple:red:sweet
banana:yellow:sweet
cherry:red:sweet

So, to summarize:

• Default delimiter: Tab character
• To specify a different delimiter: Use the -d option followed by the desired delimiter (e.g., -d ',' for a comma, -d ' ' for a space, or even -d '::' for a double colon).

Great job noticing this detail! This understanding helps a lot when you need to format output for specific purposes, like creating CSV (Comma Separated Values) files.

Do you have any other questions about paste or other commands?