compare 2 file contents , if same delete 2nd file contents


 
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# 1  
compare 2 file contents , if same delete 2nd file contents

Give shell script....which takes two file names as input and compares the contents, is both are same delete second file's contents.....

I try with "diff"...... but confusion how to use "diff" with if ---else


Thanking you
# 2  
I think md5sum would help, and comparison is so easy and perfect
Please refer this script
Code:
file1="`md5sum filename1 |cut -d ' ' -f 1`"
file2="`md5sum filename2 |cut -d ' ' -f 1`"

if [ $file1 =  $file2 ]
then
        echo "remove the second file" ;
        # remove the second file using rm command
else
        echo "keep quite" ;
fi

# 3  
Try:

Code:
comm -13 <(sort file1) <(sort file2) > file2.tmp && mv file2.tmp file2

# 4  
Hi Krishna,

it would be hard to give reply with assumption if we don't show how your file looks like. So why don't you provide your input file and expected output?
# 5  
Code:
# compare the contents of two file , if same delete 2nd one

echo -n "Enter file 1:"
read file1
echo -n "Enter file 1:"
read file1

if [ `diff $file1 $file2 >/dev/null`  -eq 0 ]
then
	echo Same

else
	echo Different
	rm $file2
fi

With this code I tried ..bit it shows errors......

Code:
file1.txt                                      file1.txt
----------                                     -------------------------
bash-3.1# cat file1.txt            bash-3.1# cat file2.txt
1                                                1
2                                                2
3                                                3
4                                                4
5                                                5
6                                                6

Here both file contents are same...so we've to delete 2nd file.

Last edited by pludi; 03-08-2010 at 10:13 AM..
# 6  
This could help you and you can carry on after this...

Code:
#!/bin/ksh
diff filename1 filename2 >/dev/null
if [  `echo $?` -eq 0 ]
then
    echo Same

else
    echo Different
    #rm -f filename2
fi

Remove the # if you get what you want...

Last edited by malcomex999; 03-08-2010 at 05:33 AM..
 

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