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53 lines
1.7 KiB
Markdown
53 lines
1.7 KiB
Markdown
## Name
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comm - compare two sorted files line by line
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## Synopsis
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```**sh
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$ comm [options...] <file1> <file2>
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```
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## Description
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`comm` compares two **sorted** files specified by `file1` and `file2` line by line alphabetically. One of file1 and file2, but not both, can be `-`, in which case `comm` will read from the standard input for that file.
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With no options, `comm` produces a three column output, indented by tabs, of lines unique to `file1`, lines unique to `file2`, and lines common to both files. `comm` provides options to suppress the output of a specific column, use case insensitive comparison or print a summary.
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## Options
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* `-1`: Suppress the output of column 1 (lines unique to `file1`)
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* `-2`: Suppress the output of column 2 (lines unique to `file2`)
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* `-3`: Suppress the output of column 3 (lines common to `file1` and `file2`)
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* `-i`: Use case insensitive comparison of lines
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* `-c`, `--color`: Always print colored output even if the standard output is not a tty
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* `--no-color`: Do not print colored output
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* `-t`, `--total`: Print a summary
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## Arguments
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* `file1`: First file to compare. (`-` for the standard input)
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* `file2`: Second file to compare. (`-` for the standard input)
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## Examples
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```sh
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# Files should be sorted first
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$ sort < file1 > file1_sorted
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$ sort < file2 > file2_sorted
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# Display the default three-column output
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$ comm file1_sorted file2_sorted
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# Read one sorted file from the standard input
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# and only display column 3
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$ sort < file1 | comm -12c - file2_sorted | less
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# Use case insensitive comparison,
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# suppress output of all columns
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# and print a summary
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$ comm -123it file1_sorted file2_sorted
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```
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## See also
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* [`cmp`(1)](help://man/1/cmp)
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