diff and comm

diff

difference after cut|sort 2 files

diff <(cut -f2 fileA | sort) <(sort fileB)

more flags

diff -y -W 120 File_1.txt File_2.txt --suppress-common-lines
# -y        side by side, in 2 columns
# -W 120    maximum number of columns to print

comm

• single output only

comm -23 <(sort fileA) <(sort fileB)    # A∩B' (lines in A but not in B)
comm -13 <(sort fileA) <(sort fileB)    # A'∩B (lines in B but not in A)
comm -12 <(sort fileA) <(sort fileB)    # A∩B (lines in both A and B)

# 3 columns (fileA_unique   common  fileB_unique)
# -1     suppress column 1 (lines unique to fileA)
# -2     suppress column 2 (lines unique to fileB)

EOF