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 5
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 11:36:15 603
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 14:43:16 618
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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Dump a configuration file without comments or whitespace...

A short, *easy-er* to remember command for stripping whitespace and comments from a config file, (or any file for that matter). Remember regex as: slash, space, star. pound, slash, bar. pointy-hat, dollar. (or "caret, dollar" if you must) :-P

Creating A Single Image Video With Audio via ffmpeg

rename a file to its md5sum

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 the filesystem and use a progress bar

if you happen to start with out the -C switch then you a killall -USR1 e2fsck

Use bash history with process substitution

Bash has a great history system of its commands accessed by the ! built-in history expansion operator (documented elsewhere on this site or on the web). You can combine the ! operator inside the process redirection

Extract track 9 from a CD

Using mplayer to extract audio file from a CD

find all active IP addresses in a network

You send a unicast ICMP packet to each host. Many firewalls will drop that ICMP. However, in order to send the ICMP, you'll have first done an ARP request and the remote machine is unlikely to ignore that, so the computer will be in your ARP table.

list all file extensions in a directory

A shorter version

View any archive

Part of the "atool" package.

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Commands using comm (11)

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