Sponsored Content
Top Forums Shell Programming and Scripting Bash - remove duplicates without sort Post 302849313 by Don Cragun on Saturday 31st of August 2013 08:18:05 PM
Old 08-31-2013
Obviously, the simple way to do this is:
Code:
sort -u file

but you tell us we can't do that without saying why. Is there a requirement to output lines in the same order they were in in the input file? If so, is it important to keep a particular one of the duplicated lines in the output? Or, do you want every line that had one or more duplicates removed from the output?

In the 2.5 years you've been a member of this forum, there have seen dozens of examples using awk to do this where the 1st duplicated input line is kept or the last duplicated input line is kept, or all duplicated lines are removed. If keeping the same order is important, it is more difficult to keep the last duplicate than it is to keep the 1st duplicate.

So, what are the real requirements?
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Removing duplicates [sort , uniq]

Hey Guys, I have file which looks like this, Contig201#numbPA Contig1452#nmdynD6PA dm022p15.r#CG6461PA dm005e16.f#SpatPA IGU001_0015_A06.f#CG17593PA I need to remove duplicates based on the chracter matching upto '#'. for example if we consider this.. Contig201#numbPA... (4 Replies)
Discussion started by: sharatz83
4 Replies

2. Shell Programming and Scripting

Sort, Uniq, Duplicates

Input File is : ------------- 25060008,0040,03, 25136437,0030,03, 25069457,0040,02, 80303438,0014,03,1st 80321837,0009,03,1st 80321977,0009,03,1st 80341345,0007,03,1st 84176527,0047,03,1st 84176527,0047,03, 20000735,0018,03,1st 25060008,0040,03, I am using the following in the script... (5 Replies)
Discussion started by: Amruta Pitkar
5 Replies

3. UNIX for Dummies Questions & Answers

removing duplicates and sort -k

Hello experts, I am trying to remove all lines in a csv file where the 2nd columns is a duplicate. I am try to use sort with the key parameter sort -u -k 2,2 File.csv > Output.csv File.csv File Name|Document Name|Document Title|Organization Word Doc 1.doc|Word Document|Sample... (3 Replies)
Discussion started by: orahi001
3 Replies

4. Shell Programming and Scripting

bash ps; remove the header, sort and reinsert

Hi, I'm ssh'ing into a server using ruby and sending a one-liner to retrieve the output of the 'ps aux' command. So far, this is what I have: ps aux | sort -r -n -k3 | sed -e '1s/^/this is first\n/' | head -n10 With this I can insert a line at position 1, but I would rather extract the... (3 Replies)
Discussion started by: gekeha
3 Replies

5. Shell Programming and Scripting

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. Thanks (6 Replies)
Discussion started by: dvah
6 Replies

6. Shell Programming and Scripting

bash - remove duplicates

I need to use a bash script to remove duplicate files from a download list, but I cannot use uniq because the urls are different. I need to go from this: http://***/fae78fe/file1.wmv http://***/39du7si/file1.wmv http://***/d8el2hd/file2.wmv http://***/h893js3/file2.wmv to this: ... (2 Replies)
Discussion started by: locoroco
2 Replies

7. Shell Programming and Scripting

Sort data by date first and then remove duplicates

Hi , I have below data inside a file named ref.psv . I want to create a shell script which will do the below 2 points : (1) sort the file content first based on the latest date which is the last column in the file (actual file its the 175th column) (2)after sorting the file based on latest date... (3 Replies)
Discussion started by: samrat dutta
3 Replies

8. Shell Programming and Scripting

Sort and Remove duplicates

Here is my task : I need to sort two input files and remove duplicates in the output files : Sort by 13 characters from 97 Ascending Sort by 1 characters from 96 Ascending If duplicates are found retain the first value in the file the input files are variable length, convert... (4 Replies)
Discussion started by: ysvsr1
4 Replies

9. UNIX for Beginners Questions & Answers

Sort and remove duplicates in directory based on first 5 columns:

I have /tmp dir with filename as: 010020001_S-FOR-Sort-SYEXC_20160229_2212101.marker 010020001_S-FOR-Sort-SYEXC_20160229_2212102.marker 010020001-S-XOR-Sort-SYEXC_20160229_2212104.marker 010020001-S-XOR-Sort-SYEXC_20160229_2212105.marker 010020001_S-ZOR-Sort-SYEXC_20160229_2212106.marker... (4 Replies)
Discussion started by: gnnsprapa
4 Replies

10. Shell Programming and Scripting

Concatenate and sort to remove duplicates

Following is the input. 1st and 3rd block are same(block starts here with '*' and ends before blank line) , 2nd and 4th blocks are also the same: cat <file> * Wed Feb 24 2016 Tariq Saeed <tariq.x.saeed@mail.com> 2.0.7-1.0.7 - add vmcore dump support for ocfs2 * Mon Jun 8 2015 Brian Maly... (4 Replies)
Discussion started by: Paras Pandey
4 Replies
WRAP-AND-SORT(1)					      General Commands Manual						  WRAP-AND-SORT(1)

NAME
wrap-and-sort - wrap long lines and sort items in Debian packaging files SYNOPSIS
wrap-and-sort [options] DESCRIPTION
wrap-and-sort wraps the package lists in Debian control files. By default the lists will only split into multiple lines if the entries are longer than 80 characters. wrap-and-sort sorts the package lists in Debian control files and all .install files. Beside that wrap-and-sort removes trailing spaces in these files. This script should be run in the root of a Debian package tree. It searches for control, control.in, copyright, copyright.in, install, and *.install in the debian directory. OPTIONS
-h, --help Show this help message and exit. -a, --wrap-always Wrap all package lists in the Debian control file even if the entries are shorter than 80 characters and could fit in one line line. -s, --short-indent Only indent wrapped lines by one space (default is in-line with the field name). -b, --sort-binary-packages Sort binary package paragraphs by name. -k, --keep-first When sorting binary package paragraphs, leave the first one at the top. Unqualified debhelper(7) configuration files are applied to the first package. -n, --no-cleanup Do not remove trailing whitespaces. -d path, --debian-directory=path Location of the debian directory (default: ./debian). -f file, --file=file Wrap and sort only the specified file. You can specify this parameter multiple times. All supported files will be processed if no files are specified. -v, --verbose Print all files that are touched. AUTHORS
wrap-and-sort and this manpage have been written by Benjamin Drung <bdrung@debian.org>. Both are released under the ISC license. DEBIAN
Debian Utilities WRAP-AND-SORT(1)
All times are GMT -4. The time now is 05:37 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy