Visit Our UNIX and Linux User Community

Remove Duplicate Lines

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Remove Duplicate Lines
# 8  
Old 08-21-2013
Originally Posted by rdrtx1
try also:
awk 'a[$0]++ {delete a[$0]} END {for (i in a) print i}' input

That solution doesn't work. If $0 appears an odd number of times, it will be printed.

# 9  
Old 08-23-2013
I have a problem this solution. I don't want sort the text. they are doing it.




# 10  
Old 08-24-2013
Not sure if this is the most efficient use of memory:
awk ' b[$0] {c[$0]++} {a[NR]=$0;b[$0]++} END {for (i=1;i<=NR;i++) if (!(a[i] in c)) print a[i]}' file

# 11  
Old 08-24-2013
awk ' NR==FNR {a[$0]++; next} a[$0]==1' file file

Last edited by MadeInGermany; 08-24-2013 at 05:15 PM..

Previous Thread | Next Thread
Test Your Knowledge in Computers #85
Difficulty: Easy
Windows 7, Windows 8, Windows RT, Windows Phone 8, Windows Server, and the Xbox One's operating system all used the Windows NT kernel.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to remove duplicate lines?

Hi All, I am storing the result in the variable result_text using the below code. result_text=$(printf "$result_text\t\n$name") The result_text is having the below text. Which is having duplicate lines. file and time for the interval 03:30 - 03:45 file and time for the interval 03:30 - 03:45 ... (4 Replies)
Discussion started by: nalu
4 Replies

2. Shell Programming and Scripting

Remove lines containing 2 or more duplicate strings

Within my text file i have several thousand lines of text with some lines containing duplicate strings/words. I would like to entirely remove those lines which contain the duplicate strings. Eg; One and a Two is the Best This as a Line Line Example duplicate sentence with the word... (22 Replies)
Discussion started by: martinsmith
22 Replies

3. Shell Programming and Scripting

Remove duplicate lines from a file

Hi, I have a csv file which contains some millions of lines in it. The first line(Header) repeats at every 50000th line. I want to remove all the duplicate headers from the second occurance(should not remove the first line). I don't want to use any pattern from the Header as I have some... (7 Replies)
Discussion started by: sudhakar T
7 Replies

4. Shell Programming and Scripting

remove duplicate lines with condition

hi to all Does anyone know if there's a way to remove duplicate lines which we consider the same only if they have the first and the second column the same? For example I have : us2333 bbb 5 us2333 bbb 3 us2333 bbb 2 and I want to get us2333 bbb 10 The thing is I cannot... (2 Replies)
Discussion started by: vlm
2 Replies

5. Shell Programming and Scripting

Need to remove the duplicate lines from a log!!

Hello Folks, Can some one help me with the removal of duplicate lines from a log file and send it to another log file. It's bit complicated as two lines are same but only difference is the timestamp, but some lines are uniq. Line has been seperated by colon's. Log file:... (5 Replies)
Discussion started by: sim_je
5 Replies

6. Shell Programming and Scripting

Remove duplicate lines

Hi, I have a huge file which is about 50GB. There are many lines. The file format likes 21 rs885550 0 9887804 C C T C C C C C C C 21 rs210498 0 9928860 0 0 C C 0 0 0 0 0 0 21 rs303304 0 9941889 A A A A A A A A A A 22 rs303304 0 9941890 0 A A A A A A A A A The question is that there are a few... (4 Replies)
Discussion started by: zhshqzyc
4 Replies

7. Shell Programming and Scripting

remove duplicate lines using awk

Hi, I came to know that using awk '!x++' removes the duplicate lines. Can anyone please explain the above syntax. I want to understand how the above awk syntax removes the duplicates. Thanks in advance, sudvishw :confused: (7 Replies)
Discussion started by: sudvishw
7 Replies

8. UNIX for Dummies Questions & Answers

Remove Duplicate lines from File

I have a log file "logreport" that contains several lines as seen below: 04:20:00 /usr/lib/snmp/snmpdx: Agent snmpd appeared dead but responded to ping 06:38:08 /usr/lib/snmp/snmpdx: Agent snmpd appeared dead but responded to ping 07:11:05 /usr/lib/snmp/snmpdx: Agent snmpd appeared dead but... (18 Replies)
Discussion started by: Nysif Steve
18 Replies

9. Shell Programming and Scripting

how to remove duplicate lines

I have following file content (3 fields each line): 23 888 dfh 787 dssf dgfas dsgas dg df dasa df dag dfd dfdas dfd dfd daf nfd ... as can be seen, that the third field is ip address and sorted. but... (3 Replies)
Discussion started by: fredao
3 Replies

10. Shell Programming and Scripting

Remove Duplicate Lines in File

I am doing KSH script to remove duplicate lines in a file. Let say the file has format below. FileA 1253-6856 3101-4011 1827-1356 1822-1157 1822-1157 1000-1410 1000-1410 1822-1231 1822-1231 3101-4011 1822-1157 1822-1231 and I want to simply it with no duplicate line as file... (5 Replies)
Discussion started by: Teh Tiack Ein
5 Replies

Featured Tech Videos