Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

remove all duplicate lines from all files in one folder

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting remove all duplicate lines from all files in one folder
# 8  
Old 05-30-2009
Quote:
Originally Posted by colemar
FILENAME==s is always true since it can happen only just after s=FILENAME.

>FILENAME is writing to the same file that awk is reading, I believe this is not a good idea. Plus, to append to a file you need to use >>.

The code can be reworked as:
Code:
mkdir tmp
awk '!a[$0]++{print$0>>"tmp/"FILENAME}' txt*

You should not use >> unless you want to preserve what was there in the file before the awk script runs. you should use a > operator.

Again, if there are many files, you should close them or elsem due to the OS limitation, you may find some errors.It is always a good idea to close them explicitly. use

Code:
close(filename)

# 9  
Old 05-30-2009
Quote:
Originally Posted by devtakh
You should not use >> unless you want to preserve what was there in the file before the awk script runs. you should use a > operator.
Right. In this case however >> does not hurt, since the files are newly created.

Quote:
Originally Posted by devtakh
Again, if there are many files, you should close them
Right. It is funny that I didn't include a close() because you originally didn't provide it.

Code:
mkdir tmp
awk 'FILENAME!=s{if(s)close(s);s=FILENAME}!a[$0]++{print$0>"tmp/"s}' txt*

This code tends to delete more lines in files that come later in ASCII-order, hence it is not the best solution according to the original poster.
Last edited by colemar; 05-30-2009 at 08:50 AM..
Login or Register to Ask a Question

Previous Thread | Next Thread

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. Windows & DOS: Issues & Discussions

Remove duplicate lines from text files.

So, I have text files, one "fail.txt" And one "color.txt" I now want to use a command line (DOS) to remove ANY line that is PRESENT IN BOTH from each text file. Afterwards there shall be no duplicate lines. (1 Reply)
Discussion started by: pasc
1 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. UNIX for Dummies Questions & Answers

Remove Duplicate Lines

Hi I need this output. Thanks. Input: TAZ YET FOO FOO VAK TAZ BAR Output: YET VAK BAR (10 Replies)
Discussion started by: tara123
10 Replies

5. Shell Programming and Scripting

How do I remove the duplicate lines in this file?

Hey guys, need some help to fix this script. I am trying to remove all the duplicate lines in this file. I wrote the following script, but does not work. What is the problem? The output file should only contain five lines: Later! (5 Replies)
Discussion started by: Ernst
5 Replies

6. Shell Programming and Scripting

[uniq + awk?] How to remove duplicate blocks of lines in files?

Hello again, I am wanting to remove all duplicate blocks of XML code in a file. This is an example: input: <string-array name="threeItems"> <item>item1</item> <item>item2</item> <item>item3</item> </string-array> <string-array name="twoItems"> <item>item1</item> <item>item2</item>... (19 Replies)
Discussion started by: raidzero
19 Replies

7. 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

8. Shell Programming and Scripting

perl/shell need help to remove duplicate lines from files

Dear All, I have multiple files having number of records, consist of more than 10 columns some column values are duplicate and i want to remove these duplicate values from these files. Duplicate values may come in different files.... all files laying in single directory.. Need help to... (3 Replies)
Discussion started by: arvindng
3 Replies

9. 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

10. Shell Programming and Scripting

how to remove duplicate lines

I have following file content (3 fields each line): 23 888 10.0.0.1 dfh 787 10.0.0.2 dssf dgfas 10.0.0.3 dsgas dg 10.0.0.4 df dasa 10.0.0.5 df dag 10.0.0.5 dfd dfdas 10.0.0.5 dfd dfd 10.0.0.6 daf nfd 10.0.0.6 ... as can be seen, that the third field is ip address and sorted. but... (3 Replies)
Discussion started by: fredao
3 Replies
Login or Register to Ask a Question