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Help With Backward grep

 
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# 1  
Old 11-16-2011
Wrench Help With Backward grep
hey, i got 2 files with the following content:

file1:
Code:
LOCAL_GSK1
50:01:24:80:45:f1:15:23
50:01:24:81:45:f1:15:23
50:01:24:82:45:f1:15:23
50:01:24:83:45:f1:15:23
LOCAL_GSK2
50:01:24:82:00:9c:d7:a7
50:01:24:82:01:bc:d7:a7
50:01:24:82:02:dc:d7:a7
50:01:24:82:03:fc:d7:a7
LOCAL_GSK3
50:01:24:80:45:39:a7:0b
50:01:24:81:45:39:a7:0b
50:01:24:82:45:39:a7:0b
50:01:24:83:45:39:a7:0b
LOCAL_GSK4
50:01:24:80:45:c1:3b:33
50:01:24:81:45:c1:3b:33
50:01:24:82:45:c1:3b:33
50:01:24:83:45:c1:3b:33
REMOTE_GSK1
50:01:24:80:45:bd:3e:5f
50:01:24:81:45:bd:3e:5f
50:01:24:82:45:bd:3e:5f
50:01:24:83:45:bd:3e:5f

file2:
Code:
10:00:00:05:1e:03:65:59
10:00:00:05:1e:03:65:59
50:00:09:73:10:03:71:04
50:00:09:73:10:03:71:05
50:00:09:73:10:03:71:00
50:00:09:73:10:03:71:01
50:01:24:80:45:bd:3e:5f
50:01:24:81:45:bd:3e:5f
50:01:24:80:45:31:ad:63
50:01:24:81:45:31:ad:63
50:01:24:80:45:69:80:fb
50:01:24:81:45:69:80:fb
50:01:24:80:45:39:a7:0b
50:01:24:81:45:39:a7:0b
21:00:00:24:ff:30:35:7b
21:00:00:24:ff:30:35:7a
21:00:00:24:ff:30:35:6a
21:00:00:24:ff:30:35:6b
21:00:00:24:ff:30:35:7e
21:00:00:24:ff:30:35:7f

what i need is to search in file1 and compare it to file2
if a match was found then
print the match found and the group name
for example searching for:
file1
Code:
50:01:24:81:45:bd:3e:5f
50:01:24:81:45:39:a7:0b

will print this from file2
Code:
REMOTE_GSK1
50:01:24:81:45:bd:3e:5f
LOCAL_GSK3
50:01:24:81:45:39:a7:0b

any help would be appreciated Smilie
thank u all.
# 2  
Old 11-16-2011
I get a different result, could you check if your example output is correct with respect to the posted content?

Code:
awk 'END { 
  if (f) 
    print f 
    }
NR == FNR { 
  f1[$1] 
  next
  }
/^[^0-9]/ { 
  if (f) { 
    print f 
    f = null 
    } 
  g = $0 
  }
$1 in f1  { 
  f = f ? f RS $1 : g RS $1 
  }' file2 file1

This User Gave Thanks to radoulov For This Post:
boaz733
 
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