Convert a TSV (tab-separated values) file to a CSV (comma-separated values) file

tab2csv.sh

#!/bin/sh

# Convert a TSV (tab) file to a CSV (comma) file
#
# Please note that this will surround all values with
# double-quotes. All other double-quotes will be escaped.
#
# Example usage:
#   ./tab2csv.sh myfile.tsv > myfile.csv

sed 's/"/\\"/g' $1 \
  | sed $'s/\t/","/g' \
  | sed 's/^/"/g' \
  | sed 's/$/"/g'