| -a FILENUM |
also print unpairable lines from file FILENUM, where FILENUM is 1 or 2, corresponding to FILE1 or FILE2
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| -e STRING |
replace missing (empty) input fields with STRING
I.e., missing fields specified with '-12jo' options
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| -i |
ignore differences in case when comparing fields
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| -j FIELD |
equivalent to '-1 FIELD -2 FIELD'
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| -o FORMAT |
obey FORMAT while constructing output line
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| -t CHAR |
use CHAR as input and output field separator
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| -1 FIELD |
join on this FIELD of file 1
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| -2 FIELD |
join on this FIELD of file 2
|