Compare files using awk


 
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# 1  
Old 06-04-2012
Compare files using awk

Please help me to compare two files and remove the items in file2 from file1

file 1:delimited using pipe(|)

file1
Code:
 
00012|Description - 1|||||AA12345|1|AB12345|2|2012/06/03
AB123|Description - 2|||||AA12345|3|ZA11111|4|2012/06/04
11111|Description - 3|||||AP00012|1|AB12345|2|2012/06/03
ABCDE|Description,description - 4|||||PA12345|10|AB12345|20|2012/06/03

file2
Code:
 
11111
o1234
00012

Expected output

output
Code:
 
AB123|Description - 2|||||AA12345|3|ZA11111|4|2012/06/04
11111|Description - 3|||||AP00012|1|AB12345|2|2012/06/03
ABCDE|Description,description - 4|||||PA12345|10|AB12345|20|2012/06/03

Here output doesnot contain first row in file1(row containing 00012) since file2 contains 00012. Comparioson should happen between first item in file1 and item in file2.So even if 00012 is present in the 3rd row ,it is not removed

Also, is there any way to direct the removed rows/items to another output file
# 2  
Old 06-04-2012
but how come this line in file 1 is not removed ??
"11111" since this number is present in both the files... it should be removed right?
# 3  
Old 06-04-2012
It depends on what you want to select. If you want only those rows of file1 where field 1 is in file2 than use:

Code:
awk 'BEGIN{FS="|"}NR==FNR{a[$1]=$1;next}a[$1]' file2 file1 >selected_lines

If you want to deselect rows of file1 where field 1 is not in file2 than use:

Code:
awk 'BEGIN{FS="|"}NR==FNR{a[$1]=$1;next}!a[$1]' file2 file1 >selected_lines

This User Gave Thanks to sdf For This Post:
# 4  
Old 06-04-2012
Code:
[root@ jun4]# cat file1
00012|Description - 1|||||AA12345|1|AB12345|2|2012/06/03
AB123|Description - 2|||||AA12345|3|ZA11111|4|2012/06/04
11111|Description - 3|||||AP00012|1|AB12345|2|2012/06/03
ABCDE|Description,description - 4|||||PA12345|10|AB12345|20|2012/06/03
[root@ jun4]# cat file2
11111
o1234
00012
[root@jun4]# ./com.sh
[root@jun4]# cat file1
AB123|Description - 2|||||AA12345|3|ZA11111|4|2012/06/04
ABCDE|Description,description - 4|||||PA12345|10|AB12345|20|2012/06/03

my primitive code :-p

Code:
while read line1
do
        while read line2
        do
                first=$( echo $line1 | cut -d'|' -f1 )
#               echo "first : $first"
#               echo "line2: $line2"
                if [[ "$first" == "$line2" ]];then
#                       echo "matched"
                        echo $line1>>file3 #redirecting deleted line to new file: file3"
                        lineNo=$( grep -n "^$first" file1 | cut -d':' -f1 )
#                       echo "lineNO: $lineNo"
                        echo "`sed -e ''$lineNo'd' file1`" >file1
                fi
        done<file2
done<file1

# 5  
Old 06-05-2012
Thanks Vivek,its my mistake.11111 should be removed from the output as it is present in file2

file1

Code:
 
00012|Description - 1|||||AA12345|1|AB12345|2|2012/06/03
AB123|Description - 2|||||AA12345|3|ZA11111|4|2012/06/04
11111|Description - 3|||||AP00012|1|AB12345|2|2012/06/03
ABCDE|Description,description - 4|||||PA12345|10|AB00012|20|2012/06/03

file2

Code:
 
11111
o1234
00012

Expected output

output

Code:
 
AB123|Description - 2|||||AA12345|3|ZA11111|4|2012/06/04
ABCDE|Description,description - 4|||||PA12345|10|AB00012|20|2012/06/03

# 6  
Old 06-05-2012
oh okay.. :-)
# 7  
Old 06-09-2012
Quote:
Originally Posted by sdf
It depends on what you want to select. If you want only those rows of file1 where field 1 is in file2 than use:

Code:
awk 'BEGIN{FS="|"}NR==FNR{a[$1]=$1;next}a[$1]' file2 file1 >selected_lines

If you want to deselect rows of file1 where field 1 is not in file2 than use:

Code:
awk 'BEGIN{FS="|"}NR==FNR{a[$1]=$1;next}!a[$1]' file2 file1 >selected_lines

i used the below code
Code:
 
awk 'BEGIN{FS="|"}NR==FNR{a[$1]=$1;next}a[$1]'

This gives me the error

Code:
 
a[$1]': Event not found

Changed the code by adding '\' as
Code:
 
nawk 'BEGIN{FS="|"}NR==FNR{a[$1]=$1;next}\!a[$1]'

It worked.Hope this is correct.Thanks to sdf and Vivek
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