linux - how to Aggregate files or merge -

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can 1 merge defferent files common data (columns)? please =(

file1.txt  id   kg   year    3454  1000  2010 3454  1200  2011 3323  1150  2009 2332  1000  2011 3454  1156  201  file2.txt  id    place 3454  a1 3323  a2 2332  a6 5555  a9  file 1+2  id     kg   year place 3454  1000  2010 a1 3454  1200  2011 a1 3323  1150  2009 a2 2332  1000  2011 a6 3454  1156  2013 a1

so second file should connected first. can see id 5555 file 2 not using.

how in linux or....

if don't care maintaining order of lines, use karakfa's join command.

to keep original order of lines, use awk

awk '     nr==fnr {place[$1]=$2; next}     $1 in place {print $0, place[$1]} ' file2.txt file1.txt | column -t 
id    kg    year  place 3454  1000  2010  a1 3454  1200  2011  a1 3323  1150  2009  a2 2332  1000  2011  a6 3454  1156  201   a1

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