Sorting text files or other data, for example with the sort utility.

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71
votes
12answers
38k views

how do you sort du output by size?

How do you sort du -sh /dir/* by size? I read one site that said use | sort -n but that's obviously not right. Here's an example that is wrong. [~]# du -sh /var/* | sort -n 0 /var/mail 1.2M ...
37
votes
5answers
29k views

What is the difference between “sort -u” and “sort | uniq”?

Everywhere I see someone needing to get a sorted, unique list, they always pipe to sort | uniq. I've never seen any examples where someone uses sort -u instead. Why not? What's the difference, and why ...
27
votes
2answers
928 views

Why is sort -o useful?

UNIX philosophy says: do one thing and do it well. Make programs that handle text, because that is a universal interface. The sort command, at least GNU sort, has an -o option to output to a file ...
25
votes
8answers
21k views

List files sorted numerically

I have a bunch of files from log1 to log164. I'm trying to LIST the directory (sorted) in a UNIX terminal but the sort functions are only providing the format like this: home:logs Home$ ls -1 | sort ...
24
votes
6answers
13k views

sort but keep header line at the top

I am getting output from a program that first produces one line that is a bunch of column headers, and then a bunch of lines of data. I want to cut various columns of this output and view it sorted ...
24
votes
4answers
7k views

sort inplace - like sed --in-place - exists?

Am I blind or is there no option like --in-place for sort? In order to save results to the input file, sed uses -i (--in-place). Redirecting the output of sort to the input file sort < f > f ...
23
votes
5answers
24k views

Sorting the output of “find”?

I need to be able to alphabetically sort the output of find before piping it to a command. Entering | sort | between didn't work, so what could I do? find folder1 folder2 -name "*.txt" -print0 | ...
23
votes
1answer
756 views

Why is sort changing the order of lines with identical sort keys?

Here is the data: D 2 B 2 A 2 When I run this command: sort -k2,2 file it outputs: A 2 B 2 D 2 My question is that when I specify only the second column -k2,2, why is it that it sorts by the ...
20
votes
2answers
24k views

Trying to sort on two fields, second then first

I am trying to sort on multiple columns. The results are not as expected. Here's my data (people.txt): Simon Strange 62 Pete Brown 37 Mark Brown 46 Stefan Heinz 52 Tony Bedford 50 John Strange 51 ...
18
votes
3answers
2k views

Why is coreutils sort slower than Python?

I wrote the following script to test the speed of Python's sort functionality: from sys import stdin, stdout lines = list(stdin) lines.sort() stdout.writelines(lines) I then compared this to the ...
15
votes
4answers
21k views

How to list files sorted by modification date recursively (no stat command available!)

How can I get the list of all files under current directory along with their modification date and sorted by that date? Now I know how to achieve that with find, stat and sort, but for some weird ...
15
votes
2answers
2k views

How does awk '!a[$0]++' work?

This one-liner removes duplicate lines from text input without pre-sorting. For example: $ cat >f q w e w r $ awk '!a[$0]++' <f q w e r $ The original code I have found on the internets ...
15
votes
4answers
5k views

How can I remove duplicates in my .bash_history, preserving order?

I really enjoying using control+r to recursively search my command history. I've found a few good options I like to use with it: # ignore duplicate commands, ignore commands starting with a space ...
13
votes
5answers
6k views

case-insensitive search of duplicate file-names

I there a way to find all files in a directory with duplicate filenames, regardless of the casing (upper-case and/or lower-case)?
12
votes
4answers
348 views

Sort lines by number of words per line

Given input: hello: world foo bar baz bar: baz: bin boop bop fiz bang beep bap: bim bam bop boatkeeper: poughkeepsie I would like to sort it into most words at the top, to least at the end, like ...
12
votes
2answers
4k views

Why does ls sorting ignore non-alphanumeric characters?

When sorting file names, ls ignores characters like -,_. I expected it to use those characters in sorting as well. An example: touch a1 a2 a-1 a-2 a_1 a_2 a.1 a.2 a,1 a,2 Now display these files ...
11
votes
3answers
744 views

Sorting data faster approach

I need to sort a bed file randomly 10000 times and take the top 1000 rows each time. Currently, I am using the following code: for i in {1..100}; do for j in {1..100}; do sort -R ...
11
votes
4answers
828 views

Shuffle file randomly with some additional constraints

I have a huge music playlist and, while some artists have many albums, others have just one song. I wanted to sort the playlist so the same artist won't play twice in a row, or his songs won't end up ...
10
votes
3answers
7k views

How to sort the string which combined with string + numeric using bash script?

This is the data what I want to sort. But sort treats the numeric to string, the data it no sorted as I expected. /home/files/profile1 /home/files/profile10 /home/files/profile11 ...
10
votes
2answers
30k views

Sort based on the third column

I'm facing a huge 4-columns file. I'd like to display the sorted file in stdout based on its 3rd column: cat myFile | sort -u -k3 Is that enough to perform the trick?
10
votes
1answer
113 views

Fastest way to delete duplicates in large wordlist?

I need to deduplicate a large wordlist. I tried several commands and did some research here and here where they explain that the fastest way to deduplicate a wordlist seems to be using awk. awk ...
9
votes
4answers
6k views

How do I make ls sort underscore characters first?

I like being able to name files and directories with an underscore prefix if it's something I want to keep separate from other files and directories at the same level. On Windows and Mac, for example, ...
8
votes
2answers
6k views

How to sort big files?

I have a PC with Intel(R) Pentium(R) CPU G640 @ 2.80GHz and 8 GByte RAM. Installed Scientific Linux 6.5 on it with EXT3 filesystem. Q: What is the fastest way I can do a "sort -u list.txt -o ...
8
votes
6answers
12k views

Get text-file word occurrence count of all words & print output sorted

I had a command which would work through a text file, count all the occurrences of the words and print it out like this: remy@box $˜ magic-command-i-forgot | with grep | and awk | sort ./textfile.txt ...
8
votes
7answers
2k views

How to sort (by whatever key) BibTex entries in `.bib` file?

I work with LaTeX and do versioning with Git. For bibliography management I use Mendeley. The problem is that each time Mendeley synchronizes it's .bib exports, they are in different order, what ...
8
votes
1answer
668 views

Is gnu coreutils sort broken?

Consider the following input to sort: cat > foo <<EOM D,,5014978 DD,,25 D,I,1972765530 D,Y,4223624 -,Y,71285059 YA,I,2 EOM Now try running sort foo The output is not sorted when trying ...
8
votes
5answers
619 views

How intelligent are unix utilities?

Unix utilities like sort, find, grep, diff et al are very handy to perform quick tasks, sometimes without writing any code at all. I wanted to know what algorithms do they internally use and how do ...
8
votes
2answers
712 views

sort by hex value

Using coreutils sort, how can I sort numerically by a hexadecimal value (field)? I was expecting something along the lines of sort -k3,3x file_to_sort however, such an x does not exist. Edit: ...
7
votes
2answers
4k views

Counting number of times each IP address appears in log file

I have a file in the format as follows: $ cat file.txt 27.33.65.2 27.33.65.2 58.161.137.7 121.50.198.5 184.173.187.1 184.173.187.1 184.173.187.1 What's the best way to parse the file file.txt into ...
7
votes
4answers
418 views

Sort fields inline

I'm trying to sort within a line of input over an unknown number of fields: Input: ab bc bc ab cd ef bc bc cd ef cd bc ab ef ab bc cd gh Output: ab bc ab bc bc cd ef bc cd ef ab cb cd ab bc cd ...
7
votes
2answers
183 views

Sorting a file with integer in parentheses with no space

I am trying to sort a file like this (which is a list of subroutine names) cfn=(1370) __lib_file_MOD_file_open fn=(1368) __universe_MOD_general_boot fn=(916) __universe_MOD_general_main fn=(6142) ...
7
votes
3answers
461 views

How to sort vertically and horizontally?

Before (INPUT.txt): Foo#1 Foo#2 Foo#3 Foo#4 Foo#4 Foo#5 SUM Bar#1 0 0 0 0 3 0 3 Bar#2 2 0 1 0 0 0 3 Bar#3 0 0 0 2 2 0 4 Bar#4 0 0 1 ...
7
votes
3answers
851 views

Unix sort out of memory

I'm sorting a 25 GB file containing 200M lines on Fedora 18 using: sort -S 10G -T /bigdisk bigfile and I am getting process killed due to no memory. The process isn't maxing out my RAM before death ...
7
votes
2answers
84 views

Sort command inconsistent behavior

I want to sort two files but I cannot get consistent results. It seems there are problems with collation but I cannot understand the reason. In sample files separator is a single space: file1: a b B ...
6
votes
4answers
1k views

uniq a csv file ignoring a column, awk maybe?

Given this file (annotations are not part of file, but form part of explanation)... x,a,001,b,c,d,y x,a,002,b,c,e,yy x,bb,003,b,d,e,y x,c,004,b,d,e,y x,c,005,b,d,e,y # nb - dupe of row 4 ...
6
votes
5answers
826 views

Grouped sorting of continuous paragraphs (separated by blank line)?

I think I'm pretty experienced now in sorting by columns; however, I haven't found anything so far how to sort continuous rows. Supposing we have a text file that looks like this: (very simplified, ...
6
votes
3answers
283 views

Print random lines respecting the order of the source file

I have a large text file (~500K lines) with short sentences (couple of words long). Additionally, there is some XML markup in most of the lines. Finally, the text file has been sorted before the ...
6
votes
5answers
3k views

Any tricks to speed up sort?

For example for bzip there is pbzip, a parallel version of bzip. Is there any such parallelization tools for sort to improve performance?
6
votes
2answers
3k views

sort output by column

I'd like to take this command find -maxdepth 1 -type d | while read -r dir; do printf "%s:\t" "$dir"; find "$dir" | wc -l; done ( from here ). which has an output of basically ./kennel: 11062 ...
6
votes
3answers
572 views

sum columns based on matching fields

I have encountered a problem that exceeds my basic unix knowledge and would really appreciate some help. I have a large file in the following format: 2 1019 0 12 2 1019 3 0 2 1021 0 2 ...
6
votes
2answers
230 views

Sorting with Perl respecting Locale Settings

Following data needs to be sorted respecting the locale sort order: wird sin wär pêche war Über Uber péché peach There was nor problem by using sort $ sort < data peach pêche péché sin Uber ...
6
votes
4answers
150 views

Find newest file. Multiple Filetype restrictions

I want to write a command that gives me the newest file in a directory recursively. But that's not my only limitation. The files has to be an mp3 or a jpg file. (case insensitive prefered) I only need ...
6
votes
2answers
873 views

Sort files by modification time

I've seen many questions and answers here using a construction along the lines of list_dir=`ls -t /path/to/dir/` for i in $list_dir; do or ls -t | while read i; do Now, I know that you shouldn't ...
6
votes
3answers
1k views

sort at jobs chronologically

Possibly a simple solution I misplaced. How can I get the output of atq sorted chronologically, so I can easily see who's due to run next? The man page for sort doesn't have anything built-in to ...
6
votes
2answers
962 views

How would I sort these directory names numerically?

I'm aware that I can somehow sort this output numerically (so cpu1/ follows cpu0/) ... I could probably get something to work eventually by splitting up the string various ways with awk, but is there ...
6
votes
3answers
4k views

What's the default order of Linux sort?

For a long period I thought the default behavior of the sort program was using ASCII order. However, when I input the following lines into sort without any arguments: # @ I got: @ # But ...
6
votes
2answers
542 views

sort every field numerically, varying field counts

I'm trying to sort some data using sort. I noticed it was sorting by digit rather than number, so I added the -n flag. It then seemingly only numerically sorts on the first field though. Breaking it ...
6
votes
1answer
254 views

How to specify additional parameters for GNU sort's --compress-program option?

sort --compress-program=/bin/gzip works fine, but how can I pass options down to the compression programm (e.g. --best or --fast)? sort --compress-program=/bin/gzip\ --best failes with the error ...
6
votes
1answer
212 views

How to make a list generated by md5deep in alphabetical order of relative paths?

If I want make a md5sum list recursively, then I would use md5deep, but it starts to pop up some problems such as it won't generate the md5sum file in alphabetical order. For example, $ cd ...
6
votes
1answer
123 views

biggest possible number for sort -n

How to determine the "biggest number" so that sort -n will always put it at the end? I'm thinking of something along Inf in some languages but I'm not sure if anything like this exists for sort. ...