tldr/pages/common/comm.md

comm

Select or reject lines common to two files. Both files must be sorted.

• Produce three tab-separated columns: lines only in first file, lines only in second file and common lines:

comm {{file1}} {{file2}}

• Print only lines common to both files:

comm -12 {{file1}} {{file2}}

• Print only lines common to both files, read one file from stdin:

cat {{file1}} | comm -12 - {{file2}}

• Print lines only found in first file:

comm -23 {{file1}} {{file2}}

• Print lines only found in second file:

comm -13 {{file1}} {{file2}}