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remove duplicates and sort

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# 1  
Old 04-06-2011
remove duplicates and sort
Hi,

I'm using the below command to sort and remove duplicates in a file. But, i need to make this applied to the same file instead of directing it to another.

Quote:
sort -k 1,1 -u file
Thanks
# 2  
Old 04-06-2011
Code:
sort -k 1,1 -u file > file.tmp; mv file.tmp file

This User Gave Thanks to bartus11 For This Post:
dvah
# 3  
Old 04-06-2011
I had a similar problem with a list of IP addresses. Best solution I was able to come up with was:
Code:
TMPFILE=$(mktemp /tmp/rbip.XXXXXX)

sort -n -t '.' -k 1,1 -k 2,2 -k 3,3 -k 4,4 <ip_list|uniq >>$TMPFILE

cp $TMPFILE ip_list

rm $TMPFILE

This User Gave Thanks to linuxhitman For This Post:
dvah
# 4  
Old 04-06-2011
If you have the data comma separated and want to sort the second column:

Code:
 $ sort -t, file1 -k 2,2 | uniq -u >file2

# 5  
Old 04-06-2011
cp and mv are inode destructive for the destination file.
so some situation may prefer
Code:
cat  $TMPFILE >$FILE && rm $TMPFILE

# 6  
Old 04-06-2011
Quote:
Originally Posted by ctsgnb
Code:
cat  $TMPFILE >$FILE && rm $TMPFILE

This method also preserves ownership and permissions.
# 7  
Old 04-06-2011
Thanks ctsgnb, I have never tried your method but I will now.
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