Sorry to be a wet blanket but neither the grep nor the uniq approach will fulfill the requirement, even if the data was in sorted order (which it isn't).
1) Do both files have exactly the same number of records and are you just looking for records which have changed? Does the order of the output into file3 matter?
2) If there can be more or less records in file2 than file1, does the order of the output into file3 matter?
Are you also interested in records which exist in file1 but do not exist in file2?
3) What percentage of differences do you expect? (This is really a performance question because some approaches would involve multiple lookups).
4) If this proves too difficult for shell programming, do you have a mainstream database engine?
---------- Post updated at 15:05 ---------- Previous update was at 14:20 ----------
One shell approach if the order of the output does not matter.
Tried with two approx 5 million record files of 500 Mb each. Took about 5 mins to run and the output only shows the mismatched records from file2. Actual performance will depend on how fast you computer is and how much memory you can give to sort.
When sorting large files be sure to set $TMPDIR to somewhere with enough space for at least twice the size of the file being sorted.
hey guys, I have two files both with two columns, I have already created an
awk code to ignore certain lines (e.g lines that start with 963) as they wou
ld begin with a certain string, however, the rest I have added together and
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Hi guys,
I need some help to come out with a solution . I have seven such files but I am showing only three for convenience.
filea
a5 20
a8 16
fileb
a3 42
a7 14
filec
a5 23
a3 07
The output file shoud contain the data in table form showing first field of... (7 Replies)
You have two files to compare by searching keyword from one file into another file
File A
23 >pp_ANSWER
24 >aa hello
25 >jau head wear
66 >jss oops
872 >aqq olps ploww oww sss
722 >GG_KILLER
..... large files
File B
Beta done
KILLER
John Mayor
calix meyers
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All,
PLease can you help me with a shell script which can compare two xml files and print the difference to a output file.
I have attached one such file for you reference.
<Group>
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FILE1
1466 55.27433 14.72050 -2.52E+03 3.00E-01 1.05E+04 2.57E+04
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compare to flat files using awk .but in 4th field contains non ordered substring. how to do that.
file1.txt
john|0.0|4|**:25;JP:50;UY:25
file2.txt
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Hi,
I have multiple files that each contain one column of strings:
File1:
123abc
456def
789ghi
File2:
123abc
456def
891jkl
File3:
234mno
123abc
456def
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Hi,
I want to compare two columns from file1 with another two column of file2 and print matched and unmatched column like this
File1
1 rs1 abc
3 rs4 xyz
1 rs3 stu
File2
1 kkk rs1 AA 10
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F1: /tmp/d21
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