Question

outer join in unix with 2 files

Asked by: yahrika

I've 2 files :

file1
-----
496223224
497448063
497425608
497440502

file2
-----
A 20212 497448063
B 12141 497425608
C 18745 497440900

I'd like to have :

result_file (only record from file2 and not in file1)
-----------
C 18745 497440900



Thx in advance,
Yassin

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Asked On
2003-02-20 at 00:23:20ID20521888
Tags

unix

,

file1

,

file2

,

join

Topic

Processor Programming for Specific Platforms

Participating Experts
5
Points
20
Comments
8

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Related Solutions

  1. outer join in unix with 2 files
    I've 2 files : file1 ----- 496223224 497448063 497425608 497440502 file2 ----- A 20212 497448063 B 12141 497425608 C 18745 497440900 I'd like to have : result_file (only record from file2 and not in file1) ----------- C 18745 497440900 Thx in advance, Yassin
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Answers

 

by: skianPosted on 2003-02-20 at 05:06:03ID: 7986939


$ grep -v -f file1 file2

I think the -f option is not standard So only GNU grep
understands this.

Stephane

 

by: yahrikaPosted on 2003-02-20 at 06:51:10ID: 7987353

This works great for a small file1 but if file2 is big

we have this error --> list too large

:(

 

by: ellesdPosted on 2003-02-20 at 08:06:06ID: 7987660

This script will do the trick:

cp file2 result_file
exec 3< file1
while read N <&3
do
  grep -v $N result_file > tmpfile$$
  mv tmpfile$$ result_file
done
rm -f tmpfile$$

The rm -f tmpfile$$ line isn't actually needed, but I usually include it as a safeguard.

Try it and let me know.

 

by: ecwPosted on 2003-03-19 at 13:29:07ID: 8169803

why not use join.  input must be sorted, so first,
  sort -n -o file1 file1
  sort -k 3n -o file2 file2
and then
  join -t ' ' -j1 1 -j2 3 -o 2.1,2.2,2.3 file1 file2

 

by: dlstaufPosted on 2003-04-10 at 09:33:12ID: 8307495

For those of us not overly fond of the bourne/ksh shell:

foreach i (`cat file1`)
  grep $i file2 >&/dev/null
  if( $status != 0 ) echo $i >>result_file
end

or if file1 is large

split file1
foreach x (x??)
  foreach i (`cat $x`)
    grep $i file2 >&/dev/null
    if( $status != 0 ) echo $i >>result_file
  end
  rm $x
end

 

by: ecwPosted on 2003-04-10 at 14:39:53ID: 8309770

Yeah, but it's hard to find aanyone who recommends programming in csh.  It's fine for "interactive" work but an abomination when one wants to do serious processing.

 

by: greentorchPosted on 2003-04-12 at 17:40:19ID: 8320492

Like this?
join -1 1 -2 3 file1 file2 -v 2

20120131-EE-VQP-002

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