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join

Join lines of two sorted files on a common field.

More information.

• Join two files on the first (default) field:

join {file1} {file2}

• Join two files using a comma (instead of a space) as the field separator:

join -t {','} {file1} {file2}

• Join field3 of file1 with field1 of file2:

join -1 {3} -2 {1} {file1} {file2}

• Produce a line for each unpairable line for file1:

join -a {1} {file1} {file2}

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