08-15-2017
Compare two big files for differences using Linux
Hello everybody
Looking for help in comparing two files in Linux(files are big 800MB each).
Example:-
File1 has below data
$ cat file1
5,6,3
2.1.4
1,1,1
8,9,1
File2 has below data
$ cat file2
5,6,3
8,9,8
1,2,1
2,1,4
Need Output as below
8,9,8
1,2,1
1,1,1
8,9,1
tried below awk command but it giving below output which is not correct
$ awk 'NR==FNR{a[$0]++;next} !a[$0]' file2 file1
2.1.4
1,1,1
8,9,1
$ cat vlookup.awk
FNR==NR{
a[$1]=$2
next
}
{ if ($1 in a) {print $1, a[$1]} else {print $1, "NA"} }
awk -f vlookup.awk file2 file1 | column -t
$ awk -f vlookup.awk file2 file1 | column -t
5,6,3
2.1.4 NA
1,1,1 NA
8,9,1 NA
treid below do while loop with grep command but its taking lot of time.
$ cat scp.sh
rm -f newfile.txt
while read line
do
line1=`grep -ie "${line}" file1`
if [ $? -ne 0 ] ; then
echo "$line" >> file2
fi
done <CUDB_REF
./scp.sh
8,9,8
1,2,1
This is correct but taking very long time for big file
Pls suggest better way which is fast.
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ZDIFF(1) General Commands Manual ZDIFF(1)
NAME
zcmp, zdiff - compare compressed files
SYNOPSIS
zcmp [ cmp_options ] file1 [ file2 ]
zdiff [ diff_options ] file1 [ file2 ]
DESCRIPTION
Zcmp and zdiff are used to invoke the cmp or the diff program on files compressed via gzip. All options specified are passed directly to
cmp or diff. If only file1 is specified, it is compared to the uncompressed contents of file1.gz. If two files are specified, their con-
tents (uncompressed if necessary) are fed to cmp or diff. The input files are not modified. The exit status from cmp or diff is pre-
served.
SEE ALSO
cmp(1), diff(1), zmore(1), zgrep(1), znew(1), zforce(1), gzip(1), gzexe(1)
BUGS
Messages from the cmp or diff programs may refer to file names such as "-" instead of to the file names specified.
ZDIFF(1)