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Add column to a CSV file as a function of other two columns, one from other file

Here is the situation: a.csv Contains values from some sensors captured every 1 second, the last column is the epoch (they actually looks like 1453998477.044).(*s are the sensors values). Example: ...
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Using join with space in key

I'm having issues merging two files using the join command: The first file is a csv file: NAIN GENIEU 01/01/1900,A,B NAIN GENIEUR 01/01/1917,C,D NAINGENIEUR 21/01/1917,E,F The second file contains ...
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Merging two Unix files

I have 2 pipe delimited files say file1 and file2. Where file1 has say 33 columns and file2 may have 34/35/36 columns. So let's not consider how many columns we have. What I want to do is compare the ...