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       combine - combine sets of lines from two files using boolean operations


       combine file1 and file2

       combine file1 not file2

       combine file1 or file2

       combine file1 xor file2

       _ file1 and file2 _

       _ file1 not file2 _

       _ file1 or file2 _

       _ file1 xor file2 _


       combine combines the lines in two files. Depending on the boolean
       operation specified, the contents will be combined in different ways:

       and Outputs lines that are in file1 if they are also present in file2.

       not Outputs lines that are in file1 but not in file2.

       or  Outputs lines that are in file1 or file2.

       xor Outputs lines that are in either file1 or file2, but not in both

       "-" can be specified for either file to read stdin for that file.

       The input files need not be sorted, and the lines are output in the
       order they occur in file1 (followed by the order they occur in file2
       for the two "or" operations). Bear in mind that this means that the
       operations are not commutative; "a and b" will not necessarily be the
       same as "b and a". To obtain commutative behavior sort and uniq the

       Note that this program can be installed as "_" to allow for the
       syntactic sugar shown in the latter half of the synopsis (similar to
       the test/[ command). It is not currently installed as "_" by default,
       but you can alias it to that if you like.




       Copyright 2006 by Joey Hess <>

       Licensed under the GNU GPL.