comm in Mac OS X
By: Strauss K
Compare two sorted files line by line.
Syntax comm [-123i] file1 file2 Options -1 Suppress printing of column 1 -2 Suppress printing of column 2 -3 Suppress printing of column 3 -i Case insensitive comparison of lines
The comm utility reads file1 and file2, which should be sorted lexically, and produces three text columns as output:
Lines only in file1; Lines only in file2; Lines in both files.
If printing of a column is suppressed, the output will be padded with TAB characters.
Each column will have a number of tab characters prepended to it equal to the number of lower numbered columns that are being printed. For example, if column number two is being suppressed, lines printed in column number one will not have any tabs preceding them, and lines printed in column number three will have one.
The
comm utility assumes that the files are lexically sorted; all characters
participate in line comparisons. The filename '-' means
standard input.
Collation sorting: the LANG, LC_ALL, LC_COLLATE, and LC_CTYPE environment
variables affect the execution of comm
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