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Remove duplicates from a file

 
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# 1  
Old 05-09-2013
Question Remove duplicates from a file
Can u tell me how to remove duplicate records from a file?
# 2  
Old 05-09-2013
can you please post your input data.

you can use

Code:
sort file | uniq -d

# 3  
Old 05-09-2013
try sort to start
Code:
sort -u filename

# 4  
Old 05-09-2013
Here is the sample input & output file-
Input- Emp.txt
Code:
Empid   Empname    Joining_Date    Salary
101       ABC       11/01/1991      5000
104       MNO       17/04/1984      12000
102       DEF       15/04/1998      8000
101       ABC       11/01/1991      5000
107       XYZ       24/09/1978      6000
104       MNO       17/04/1984      12000
101       ABC       11/01/1991      5000

Output- Emp.txt
Code:
Empid   Empname    Joining_Date    Salary
101       ABC       11/01/1991      5000
104       MNO       17/04/1984      12000
102       DEF       15/04/1998      8000
107       XYZ       24/09/1978      6000

I want the output in the same file...
Last edited by radoulov; 05-09-2013 at 06:14 AM..
# 5  
Old 05-09-2013
Quote:
Originally Posted by saga20
Here is the sample input & output file-
Input- Emp.txt
Empid Empname Joining_Date Salary
101 ABC 11/01/1991 5000
104 MNO 17/04/1984 12000
102 DEF 15/04/1998 8000
101 ABC 11/01/1991 5000
107 XYZ 24/09/1978 6000
104 MNO 17/04/1984 12000
101 ABC 11/01/1991 5000

Output- Emp.txt
Empid Empname Joining_Date Salary
101 ABC 11/01/1991 5000
104 MNO 17/04/1984 12000
102 DEF 15/04/1998 8000
107 XYZ 24/09/1978 6000

I want the output in the same file...
sort -u will work for you
# 6  
Old 05-09-2013
But sort -u will show the original records.As per my sample data as posted above,it ll get only 2 records that r unique. But i want just duplicated to be removed. So that it ll get 4 records.
# 7  
Old 05-09-2013
Sort should work not sure why are you getting 2 records..

Code:
 
awk '{A[$0]}END{for (i in A){print i}}'  filename

 
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