Hide

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

OpenID
or
Sign in Register

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Hide

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

Hide

News

2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.
Hide

Tags

Hide

Functions

Hide

Credits

Site by David Winterbottom (user root).

Commands using uniq from sorted by
Terminal - Commands using uniq - 211 results
grep -o -P '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\:[0-9]{1,5}\s->\s{5}[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\:[0-9]{1,5}' <capture file> | tr -d ' ' | sed 's/:.....//g' | sort -n | uniq -c | sort -nr
2014-03-05 21:34:42
User: santizo
Functions: grep sed sort tr uniq
1
Up
Down
Sort netflow packet capture

Sort netflow packet capture by unique connections excluding source port.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
git log origin/master..master --name-only --pretty="format:" | sort | uniq | xargs tar -rf mytarfile.tar
2014-03-04 12:17:29
User: sarfraznawaz2005
Functions: sort tar uniq xargs
1
Up
Down
Export unpushed files list
Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
cat /proc/cpuinfo | grep BogoMIPS | uniq | sed 's/^.*://g' | awk '{print($1 / 4) }'
2014-03-01 03:44:03
User: derpat
Functions: awk cat grep sed uniq
Tags: cat sed awk uniq grep /proc/cpuinfo BogoMIPS
1
Up
Down
calculate how much bogomips one cpu core has (assuming you have 4 cores).

on some distro's you have to replace "BogoMIPS" with "bogomips".

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
sort in-file.txt | uniq -u > out-file.txt
2014-02-16 07:26:37
User: SMed79
Functions: sort uniq
Tags: sort uniq duplicate text
0
Up
Down
Remove duplicate line in a text file.

Remove duplicate line in a text file.

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ls | tr [:upper:] [:lower:] | grep -oP '\.[^\.]+$' | sort | uniq -c | sort
2014-01-30 11:37:27
User: icefyre
Functions: grep ls sort tr uniq
1
Up
Down
count files by type

displays a list of all file extensions in current directory and how many files there are of each type of extension in ascending order (case insensitive)

Show sample output | Comments (3) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find . -type f -not -empty -printf "%-25s%p\n"|sort -n|uniq -D -w25|cut -b26-|xargs -d"\n" -n1 md5sum|sed "s/ /\x0/"|uniq -D -w32|awk -F"\0" 'BEGIN{l="";}{if(l!=$1||l==""){printf "\n%s\0",$1}printf "\0%s",$2;l=$1}END{printf "\n"}'|sed "/^$/d"
2013-10-22 13:34:19
User: alafrosty
Functions: awk cut find sed sort uniq xargs
Tags: size find md5sum fdupes duplicate files
1
Up
Down
Find Duplicate Files (based on size first, then MD5 hash)

* Find all file sizes and file names from the current directory down (replace "." with a target directory as needed).

* sort the file sizes in numeric order

* List only the duplicated file sizes

* drop the file sizes so there are simply a list of files (retain order)

* calculate md5sums on all of the files

* replace the first instance of two spaces (md5sum output) with a \0

* drop the unique md5sums so only duplicate files remain listed

* Use AWK to aggregate identical files on one line.

* Remove the blank line from the beginning (This was done more efficiently by putting another "IF" into the AWK command, but then the whole line exceeded the 255 char limit).

>>>> Each output line contains the md5sum and then all of the files that have that identical md5sum. All fields are \0 delimited. All records are \n delimited.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
grep cwd /var/log/exim_mainlog | grep -v /var/spool | awk -F"cwd=" '{print $2}' | awk '{print $1}' | sort | uniq -c | sort -n
2013-10-09 20:59:14
User: franB
Functions: awk grep sort uniq
0
Up
Down
Check where mail was sent from
Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find . -type f | perl -ne 'chop(); $ext = substr($_, rindex($_, ".") + 1); print "$ext\n";' | sort | uniq --count | sort -n
2013-09-26 07:45:19
User: t3o
Functions: find perl sort uniq
0
Up
Down
Find used fileextensions in a project

When trying to find an error in a hosted project it's interesting to find out how the source is organized: Are there .inc files? Or .php files only? Or .xml files that probably contain translated texts?

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
cut -d " " -f1,4 access_log | sort | uniq -c | sort -rn | head
2013-09-20 21:29:32
User: zlemini
Functions: cut sort uniq
1
Up
Down
Extract busiest times from apache access log

Analyze an Apache access log for the time period with most activity and display the hit count, requesting IP and the timestamp. May help detect a brute force dos attack.

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
cut -d ' ' -f 1 /var/log/apache2/access_logs | uniq -c | sort -n
2013-09-17 20:05:03
User: BorneBjoern
Functions: cut sort uniq
Tags: IP apache2 filter requests
0
Up
Down
Filter IP's in apache access logs based on use

avoiding UUOC!

cut can handle files as well. No neet for a cat.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
grep "10/Sep/2013" access.log| cut -d[ -f2 | cut -d] -f1 | awk -F: '{print $2":"$3}' | sort -nk1 -nk2 | uniq -c | awk '{ if ($1 > 10) print $0}'
2013-09-12 08:45:38
User: bormarek
Functions: awk cut grep sort uniq
1
Up
Down
apache statistics
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
netstat -ntu | awk ' $5 ~ /^(::ffff:|[0-9|])/ { gsub("::ffff:","",$5); print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr
2013-09-10 19:28:06
User: mrwulf
Functions: awk cut netstat sort uniq
Tags: sort awk uniq IP netstat cut
1
Up
Down
netstat with group by (ip adress)

Same as the rest, but handle IPv6 short IPs. Also, sort in the order that you're probably looking for.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
cat /var/log/apache2/access_logs | cut -d' ' -f1 | sort | uniq -c | sort -n
2013-09-07 23:57:31
User: while0pass
Functions: cat cut sort uniq
Tags: IP apache2 filter requests
1
Up
Down
Filter IP's in apache access logs based on use

The first sort is necessary for ips in a list to be actually unique.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
cat /var/log/apache2/access_logs | cut -d ' ' -f 1 | uniq -c | sort -n
2013-09-02 13:04:47
User: basvdburg
Functions: cat cut sort uniq
Tags: IP apache2 filter requests
1
Up
Down
Filter IP's in apache access logs based on use

Show's per IP of how many requests they did to the Apache webserver

Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
cut -d, -f1 /var/opt/example/dumpfile.130610_subscriber.csv | cut -c3-5 | sort | uniq -c | sed -e 's/^ *//;/^$/d' | awk -F" " '{print $2 "," $1}' > SubsxPrefix.csv
2013-07-17 07:58:56
User: neomefistox
Functions: awk cut sed sort uniq
Tags: Linux UNIX
0
Up
Down
Create a csv file with '5-digits prefix' phone numbers, as well as occurrences per prefix

dumpfile is a CSV file, which its 1st field is a phone number in format CC+10 digits

Empty lines are deleted, before the output in format "prefix,ocurrences"

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
sudo /usr/sbin/exim -bp | sed -n '/\*\*\* frozen \*\*\*/,+1!p' | awk '{print $1}' | tr -d [:blank:] | grep @ | sort | uniq -c | sort -n
2013-06-04 10:49:14
User: blueskin
Functions: awk grep sed sort sudo tr uniq
Tags: mail exim mailq
0
Up
Down
Show counts of messages in exim mail queue, grouped by recipient

Counts of messages by recipient, with frozen messages excluded.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
more restart_weblogic.log | grep "LISTEN" | awk '{ print $7 }' | uniq | wc -l
2013-05-16 08:40:57
User: cuizhaohua
Functions: awk grep more uniq wc
0
Up
Down
how much time restart the wls service?
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
tail -F some.log | perl -ne 'print time(), "\n";' | uniq -c
2013-05-11 04:51:22
User: grana
Functions: perl tail uniq
Tags: tail wc
2
Up
Down
Lines per second in a log file
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl -k https://Username:Password@api.del.icio.us/v1/posts/all?red=api | xml2| \grep '@href' | cut -d\= -f 2- | sort | uniq | linkchecker -r0 --stdin --complete -v -t 50 -F blacklist
2013-05-04 17:43:21
User: bbelt16ag
Functions: cut sort uniq
Tags: bash curl delicious xml2 linkchecker
-1
Up
Down
check your up to date delicious links.

This commands queries the delicious api then runs the xml through xml2, grabs the urls cuts out the first two columns, passes through uniq to remove duplicates if any, and then goes into linkchecker who checks the links. the links go the blacklist in ~/.linkchecker/blacklist. please see the manual pages for further info peeps. I took me a few days to figure this one out. I how you enjoy it. Also don't run these api more then once a few seconds you can get banned by delicious see their site for info. ~updated for no recursive

Show sample output | Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
awk '{print $1}' ~/.bash_history | sort | uniq -c | sort -rn | head -n 10
2013-05-03 16:24:30
User: nesses
Functions: awk head sort uniq
Tags: sort awk uniq head,
1
Up
Down
most used unix commands
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
awk '{ print $9 }' access.log | sort | uniq -c | sort -nr | head -n 10
2013-05-02 09:23:26
User: cuizhaohua
Functions: awk head sort uniq
0
Up
Down
top 10 of access log

top 10 of access log

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
awk '/Dec\/2012/ {print $1,$8}' logfile | grep -ivE '(.gif|.jpg|.png|favicon|.css|.js|robots.txt|wp-l|wp-term)' | sort | uniq -c | sort -rn | head -n 20
2013-04-30 06:51:47
User: vaaclav
Functions: awk grep head sort uniq
0
Up
Down
find top 20 results in apache statistics for a specific month
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
uniq -c | sed -r 's/([0-9]+)\s(.*)/"\2": \1,/;$s/,/\n}/;1i{'
2013-04-13 16:48:59
User: qistoph
Functions: sed uniq
Tags: uniq json
0
Up
Down
Convert uniq output to json
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
parallel -j 50 ssh {} "ls" ::: host1 host2 hostn | sort | uniq -c
2013-04-12 11:56:41
User: macoda
Functions: sort ssh uniq
1
Up
Down
Mapreduce style processing

parallel can be installed on your central node and can be used to run a command multiple times.

In this example, multiple ssh connections are used to run commands. (-j is the number of jobs to run at the same time). The result can then be piped to commands to perform the "reduce" stage. (sort then uniq in this example).

This example assumes "keyless ssh login" has been set up between the central node and all machines in the cluster.

bashreduce may also do what you want.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
svn ls -R | egrep -v -e "\/$" | tr '\n' '\0' | xargs -0 svn blame | awk '{print $2}' | sort | uniq -c | sort -nr
2013-04-10 19:37:53
User: rymo
Functions: awk egrep ls sort tr uniq xargs
Tags: svn count
1
Up
Down
Prints total line count contribution per user for an SVN repository

make usable on OSX with filenames containing spaces. note: will still break if filenames contain newlines... possible, but who does that?!

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate