How do I convert a tab-separated values (TSV) file to a comma-separated values (CSV) file in BASH?

Question

I have some TSV files that I need to convert to CSV files. Is there any solution in BASH, e.g. using awk, to convert these? I could use sed, like this,

Answer 1

The tr command :

tr '\t' ',' < file.tsv > file.csv

is simple and gave absolutely correct and very quick results for me even on a really large file (approx 10 GB).