Search and Replace with sed in Linux

# Searches all csv files in directory for pipes and replaces them with commas ("|" with ",")
# sed basic usage
# sed -i 's/foo/bar/g' FILENAME (s tells sed to search, foo = search string, bar = replace string, g = all chars on each line)
# special characters like commas require an escape e.g. \, but not all special chars for example a pipe '|' does not
# it is best to wrap this in a for loop to avoid breaking command line limits

for i in *csv; do
    sed -i 's/|/\,/g' $i
done