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Shell Programming and Scripting

Uniq based on first field

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# 8  
Old 07-22-2011
why can you not use sort?
Code:
sort -u -t ',' -k1.1,1.5 infile > outfile

# 9  
Old 07-22-2011
Quote:
Originally Posted by itkamaraj
Code:
 
$ for i in `nawk '{print $1}' test`; do count=`grep -c $i test`; [ "$count" -gt "1" ] || grep $i test; done                                        
1235 uname2 status2
1236 uname5 status5

$ cat test
1234 uname1 status1
1235 uname2 status2
1234 uname3 status3
1236 uname5 status5

@itkamaraj
I used your code also, but got 'no space' error. I think these codes are doing manipulation on memory. could you please explain your code ?
# 10  
Old 07-22-2011
if your file has 11 million lines, then go for perl coding
# 11  
Old 07-22-2011
Quote:
Originally Posted by jim mcnamara
why can you not use sort?
Code:
sort -u -t ',' -k1.1,1.5 infile > outfile

Thanks for the reply. I want to display only the unrepeated lines.
I think -u will give us single line if it founds duplicates.
and here 1.1 to 1.5 means the length of first filed. isn't it?
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