# Print lines appearing in both <file-1> and <file-2>:
comm -12 <(sort file1.csv) <(sort file2.csv)

# Print lines appearing only in <file-1>:
comm -23 <file-1> <file-2>

# For diffing CSVs from a database, consider:
# https://aswinkarthik.github.io/csvdiff/
