File1:00:00 27400:04 47600:05 45000:06 49900:07 37300:08 20600:09 47100:10 154File2:00:00 18300:01 6000:02 34400:03 54000:04 45000:07 34800:09 47300:10 203Desired output:00:00,274,18300:01,0,6000:02,0,34400:03,0,54000:04,476,45000:05,450,000:06,499,000:07,373,34800:08,206,000:09,471,47300:10,154,203Column 1 of each file will be checked and if same, values will be joined to the output. Please note the 0 value for those contents not present on either file. Also, this will be used for combining contents of 6 files. 
How to combine contents of two files having the same value in a column?
text processing;columns;join