Commands using comm sorted by votes

Commands using comm (11)

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show lines that appear in both file1 and file2
This is sample output - yours may be different.
6

comm -1 -2 <(sort file1) <(sort file2)

jcgam69 · 2009-02-19 21:10:19 7
Find common lines between two files
This is sample output - yours may be different.
2

comm -12 FILE1.sorted FILE2.sorted > common

evandrix · 2011-07-09 08:53:17 4
colorize comm output

It just colorizes the line based on if it has 0, 1 or 2 tabs at the beginning of the line. Won't work so well if lines already begin with tabs (too bad comm doesn't have an option to substitute \t for something else). Don't forget comm needs input files to be sorted. You can use a shortcut like this with bash: comm Show Sample Output
This is sample output - yours may be different.
```
comm <(printf "123\n456\n") <(printf "123\n789\n") | sed -e 's/^[^\t].*/\x1b[33m&\x1b[0m/' -e  's/^\t[^\t].*/\x1b[36m&\x1b[0m/' -e 's/^\t\t[^\t].*/\x1b[32m&\x1b[0m/'
                123
456
        789
```
1

comm file1 file2 | sed -e 's/^[^\t].*/\x1b[33m&\x1b[0m/' -e 's/^\t[^\t].*/\x1b[36m&\x1b[0m/' -e 's/^\t\t[^\t].*/\x1b[32m&\x1b[0m/'

recursiverse · 2010-05-07 00:14:31 5
Single words from Amazon Kindle 3 notes

You can use any dictionary you want, in any language. This command will output all single-word annotations that you have underlined in your Kindle device (provided the file) given a list of language-specific words. If you want to learn vocabulary, this command is ideal.
This is sample output - yours may be different.
1

awk -F" " '{ if ( NF == 1 ) { print $0 } }' KINDLE_NOTES_FILE.txt | sed -e '/^=/d' | sed -e '/^[[:space:]]*$/d' -e 's/,//g' | sort | comm -12 List_of_language_words.txt - | uniq

parmegv · 2011-08-15 14:35:33 4
Sorts and compare 2 files line by line
This is sample output - yours may be different.
1

comm -12 <(sort -u File1) <(sort -u File2)

guillaume1306 · 2018-09-07 11:36:15 439
intersection of two arrays

the comm utility (opposite of diff) show commonalities in files (in this case strings) Show Sample Output
This is sample output - yours may be different.
```
$ echo ${Array3[@]}
five four
```
0

Array1=( "one" "two" "three" "four" "five" );Array2=( "four" "five" "six" "seven" );savedIFS="${IFS}";IFS=$'\n';Array3=($(comm -12 <(echo "${Array1[*]}" |sort -u) <(echo "${Array2[*]}" | sort -u)));IFS=$savedIFS

elofland · 2010-08-23 19:25:22 4
Delimiter Hunting

Search in decimal rather than hex. od dumps the character list, cut to remove offsets, sort -u gives the used characters. seq gives the comparison list, but we need this sorted alphabetically for comm, which does the filtering. I drop to perl to convert back to characters (is there a better way?) and then use od to dump them in a print-safe format. Show Sample Output
This is sample output - yours may be different.
```
0000000  \0 001  \n   j   k  \v  \f   z   {   |   }   ~ 177  \r 016 017
0000020 020 021 022 023 002 024 025 026 027 030 031 032 033 034 035 003
0000040 036 037       !   "   #   $   %   &   ' 004   (   )   *   +   ,
0000060   -   .   /   0   1 005   2   3   4   5   6   7   8   9   :   ;
0000100 006   <   =   >   ?   @   A   B   C   D   E  \a   F   G   H   I
0000120   J   K   L   M   N   O  \b   P   Q   R   S   T   U   V   W   X
0000140   Y  \t   Z   [   \   ]   ^   _   `   a   b   c
0000154
```
0

comm -13 <(od -vw1 -tu1 dummy.txt|cut -c9-|sort -u) <(seq 0 127|sort)|perl -pe '$_=chr($_)'|od -c

bazzargh · 2012-01-09 01:32:20 8
Compare two files and output similarities to a new file

Use comm command to compare two text files and display lines that are exactly the same on both files and write those to a new output file using tee
This is sample output - yours may be different.
0

comm -1 -2 <(sort file1) <(sort file2) |& tee outputfile

poole · 2016-10-26 18:45:37 16
Generate a list of items from a couple of items lists A and B, getting (B - A ) set
This is sample output - yours may be different.
0

comm -13 ItemsListtoAvoid.txt AllItemsList.txt > ItemsDifference.txt

keltroth · 2018-10-29 14:43:16 531
Describe differences between files
This is sample output - yours may be different.
-1

comm --nocheck-order -31

dullgiulio · 2011-06-02 19:17:46 8
Save lines unique to file2

If both file1 and file2 are already sorted: comm -13 file1 file2 > file-new
This is sample output - yours may be different.
-2

comm -13 <(sort file1) <(sort file2) > file-new

daa · 2011-10-01 18:07:54 4

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To have only unique lines in a file

Converts uppercase chars in a string to lowercase

Another alternative is to define a function: lower() { echo ${@,,} } lower StrinG

Clean your broken terminal

When some console full-screen program (minicom, vi, some installers) breaks down your terminal, try this command to revert all options to "sane" settings (sane is a built-in combo of a lot of stty options)

Sort output by column

(separator = $IFS)

Start dd and show progress every X seconds

Adjust "sleep X" to your needs. *NOTE: First sleep is required because bash doesn't have a "post-test" syntax (do XXX while).

Capture screen and mic input using FFmpeg and ALSA

Yet another x11grab using ffmpeg. I also added mic input to the capturing video stream using alsa. Yet I need to find out how to capture audio which is currently playing.

Detach a process from the current shell

Continue to execute the command in background even though quitting the shell.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

check open ports without netstat or lsof

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Commands using comm (11)

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